A. Vidmachenko

A. Vidmachenko
National University of Life and Environmental Sciences of Ukraine · Physics

DrSci. Doctor of Physics and Mathematics Sciences, by specialty 01.03.03 - Geliophysics and physics of Solar system

About

655
Publications
614,714
Reads
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2,690
Citations
Citations since 2016
287 Research Items
2242 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
February 2017 - present
Main Astronomical Observatory of National Academy of Sciences of Ukraine
Position
  • Principal Investigator
Description
  • My research is devoted to study of characteristics of planetary atmospheres and exoplanets
February 2017 - present
National University of Life and Environmental Sciences of Ukraine
Position
  • Professor (Full)
January 2013 - February 2017
Main Astronomical Observatory of National Academy of Sciences of Ukraine
Position
  • Head of Department
Description
  • My research is devoted to study of characteristics of planetary atmospheres and exoplanets, experimental seismology in atmospheres of giant planets, was registered oscillations and seasonal changes in it's atmospheres.
Education
January 1998 - October 1999
Main Astronomical Observatory of Ukrainian National Academy of Sciences
Field of study
  • 01.03.03 - Geliophysics and Solar System Physics
October 1981 - November 1983
Main Astronomical Observatory of Ukrainian National Academy of Sciences
Field of study
  • 01.03.02 - Astrophysics and Radioastronomy
September 1970 - June 1975
Department of Astronomy of Faculty of Physics of Taras Shevchenko State University, Kyiv, Ukraine
Field of study
  • Astronomy and Physics

Publications

Publications (655)
Article
Full-text available
Ukraine has launch vehicles that are able to deliver about 300 kg to lunar orbit. A future Ukrainian lunar program may propose a polar orbiter. This orbiter should fill principal information gaps in our knowledge about the Moon after the Clementine and Lunar Prospector missions and future missions like Smart-1, Lunar-A, and Selene. We consider that...
Conference Paper
Full-text available
The continuous spectra of the substars with surrounding protoplanetary disks were calculated. The results reveal that protoplanetary disc average temperature decreases to 3 K during the period of 5 Myr for substars with masses 0.01M_{Sun} and during the period of 160 Myr for substars with masses 0.08M_{Sun}. Estimations of protoplanetary discs flux...
Article
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The results of polarimetric, photometric, and spectroscopic investigations of Saturn are given. Polarimetric and photometric investigations show that in the long wavelength spectral range (λ > 0.5 μm) spherical particles play the dominant role in the reflected radiation. But for λ < 0.5 μm, oriented nonspherical particles are revealed in the equato...
Conference Paper
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Precursory lunar lander experiments on growing plants in locker-based chambers will increase our understanding of effect of lunar conditions on plant physiology. The inducible CAM (Crassulacean Acid Metabolism)-plants are reasonable model for a study of relationships between environmental challenges and changes in plant/bacteria gene expression. In...
Article
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Equations for critical angles and areas that make it possible to get an idea about the configurations of the observed systems and calculate their spectral energy distributions (SEDs) in accordance with their geometrical parameters and the angles of the disc inclination toward the observer are obtained. SEDs have been calculated for the substar (M *...
Chapter
Full-text available
To assess the impact of solar ultraviolet radiation on the Earth’s biosphere, it is necessary to determine the nature of aerosol particles in the stratosphere, the seasonal change in their complex refractive index, the size of aerosol particles, the particle size distribution function, the optical thickness and their horizontal structure, the ozone...
Chapter
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27 satellites and more than a dozen rings have been found around Uranus. There are five large satellites. Between them and the inner rings is an inner group of 13 satellites; 9 more irregular bodies are located outside the large satellites; all of them are much smaller in size. The satellite system of Uranus is located in its equatorial plane. They...
Chapter
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Miranda is the smallest and closest to Uranus of its five largest moons. All of them move inside Uranus’ magnetosphere almost perpendicular to the planet’s orbit. Miranda’s images from the “Voyager-2” spacecraft revealed huge furrows, cracks up to several kilometers deep, hummocks of plates that were on top of each other, and so on. Such structure...
Chapter
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Enceladus at its small size became the second satellite after Titan, which has a noticeable atmosphere. The resulting “Cassini” images showed the smooth landscape of its surface. Under the surface of the satellite, the substance may be in a liquid state. Enceladus’ subsoil is warmed by tidal forces from interaction with other satellites and Saturn...
Article
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Introduction. The first experiments on systematic observations of meteors were conducted using photographic techniques. These were the Harvard program in Massachusetts and New Mexico, the first fireball networks in Europe, the United States and Canada. Modern observation networks are built on the basis of television technologies. The field of visio...
Chapter
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Saturn's moon Enceladus at a small size (up to 505 km) has a noticeable atmosphere. The smooth landscape of its surface indicates significant geological activity. An ocean of water is possible under the surface. The reason for the warming of the bowels of Enceladus and its water "volcanism" is considered to be tidal forces from Saturn and nearby ot...
Chapter
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It is believed that the original surface of the satellite Enceladus has changed greatly over time under the influence of geological processes over the past several hundred million years. It is possible that such changes are happening now. Even before the study of the satellite with the help of spacecraft, there were indications that the orbit of En...
Chapter
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The significant inclination of the plane of the satellite’s equator to the plane of the orbit allows us to record differences in the flow of solar energy to different latitudinal zones during the rotation around the Sun. The equator of Enceladus, like Saturn itself, is inclined to the plane of the planet's orbit by almost 27°. With a significant ec...
Chapter
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In 2005, the Huygens spacecraft, in its descent into Titan's atmosphere, obtained images of continents and "reservoirs" filled with liquid methane. Evaporating from the surface, it forms a cloud, from which it regularly rains. Precipitation feeds rivers, which fill reservoirs after rain and then dry up. Rains are seasonal and mostly fall in the aft...
Chapter
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Previously, the surface of Titan was studied through the clouds by infrared equipment of Hubble and Keck telescopes, and Very Large Telescope. With their help there were registered continents, seas, large craters. From “Cassini” examined details of the surface up to 10 km. On January 14, 2005, “Huygens” spacecraft began its descent to surface of sa...
Article
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The development of meteor astronomy in modern Ukraine is considered. The specificity of meteor observation methods requires, first of all, the organization of a network of corresponding observation points. To achieve this goal, it is proposed to combine the scientific and technical capabilities of participating organizations in the form of the Ukra...
Chapter
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January 14, 2005 “Huygens” probe entered the atmosphere and began the descent to the surface of Titan. For almost 2.5 hours, he descended by parachute, and measured the characteristics of the atmosphere. Measurements showed that the atmosphere consists mainly of nitrogen, with 1-5% methane, in small quantities there are other hydrocarbons. The devi...
Chapter
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Lakes and seas made of water-ammonia solution in methane were found on the surface of Titan. Water and ammonia can be released into the atmosphere with volcanic emissions. At radar observations, the Xanadu region is uneven and the dark regions are smooth lakes. The size of several tens of kilometers and the shape of dark round relief formations on...
Chapter
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Titan has an atmosphere about 400 km thick. The satellite is quite massive and it is very cold on it (on the surface T = 94 K). For this reason, due to the low kinetic energy of gas molecules in the atmosphere are quite light elements. The atmosphere consists of about 85% nitrogen, up to 3% methane, there is argon, ethane, propane, acetylene, methy...
Chapter
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Titan is the second largest satellite in the solar system with a diameter of 5 152 km. The atmosphere consists of nitrogen with impurities methane and some other gases. There are rains of liquid methane. These clouds are very similar to cumulus terrestrial clouds. Therefore, it was proposed to compare the Earth's water cycle with the processes on T...
Chapter
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Neptune's moon Triton has a diameter of 2705 km. It moves in an almost circular orbit with a radius of 360160 km and rotates synchronously in the opposite direction for 5.88 Earth days. Spectrophotometry of the satellite indicated the presence there of methane and nitrogen absorption bands. This is consistent with the presence on the surface of a m...
Chapter
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Europa is the Galilean moon of Jupiter. Calculations and data from spacecraft have shown that under the ice up to ten kilometers thick, there is an ocean of liquid water up to several tens of kilometers deep. The global network of lines in Europa is cracks in the ice crust caused by tectonic processes. The width of the faults is from units to hundr...
Chapter
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The average radius of the orbit of Io is 421,600 km, Europe - 670,900 km. High radiation is observed on the surface of satellites, because their orbits are in the radiation belt of Jupiter. Even at terrestrial observations of Jupiter found that the glow region of ionized and neutral sulfur and other chemical elements can be represented by a torus w...
Chapter
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The tidal energy in the Io crust heats the subsoil and leads to significant volcanic activity. The craters of various volcanoes have temperatures of 350-1800 K. The total area of volcanic craters on Io is up to 2% of the satellite's territory. Its surface consists mainly of the products of volcanic eruptions with a thickness in various places from...
Chapter
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The scattering of tidal energy heats the bowels of Jupiter's moon Io and causes its volcanic activity. In the lithosphere at shallow depths there may be isolated "lenses" of liquid sulfur. Deep magma invades this crust. It interacts with liquid sulfur and forms "lenses" of magma beneath the surface. At T=432 K, sulfur becomes a very mobile liquid i...
Chapter
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Pluto revolves around the Sun in an elliptical orbit in 248 Earth years. From 1979 to 1999, it was closer to the Sun than Neptune. The tilt of the axis of rotation is about 120°. This value indicates the existence of strongly pronounced seasons. A light lowland called the Sputnik Planitia has been discovered on Pluto. It has no traces of craters an...
Chapter
Full-text available
A small number of meteorite craters on Venus may indicate the shielding effect of the dense atmosphere, or the processes that destroy them. Radar studies have shown that 80% of the surface of Venus is occupied by plains formed by lava flows. Comparison of radar investigations of surface with its infrared images made it possible to detect active vol...
Conference Paper
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To explore distant worlds in solar system, it is necessary to create special test sites on the Moon for the development and manufacture of long-term stations.
Chapter
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Due to the very dense atmosphere, the first data on the surface of Venus were obtained only by radar methods. Then the information was supplemented by photos at the landing sites of spacecraft. The surface relief turned out to be diverse in shape, height difference and physical properties. The most common type of surface on Venus are flattened moun...
Chapter
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Volcanoes exist on Earth, Jupiter's moon Io, have long been on Mars and on Saturn's moons Titan and Enceladus. A few billion years ago, volcanoes were also on the surface of other planets and their satellites. It was previously believed that the moon's volcanoes cooled down 1-2 billion years ago. But analysis of images taken with the camera of the...
Chapter
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Investigations of the surface of many craters on Mars have indicated that streams of liquid water were there only a few years ago. Their outcrops are located at depthes of up to 150 m from the surface. This value indicates the possible depth of soil freezing. In the early 2000s, rovers discovered clay on Mars. On Earth, clay appears mainly near sou...
Chapter
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In the Jupiter’s magnetosphere the sun point changes during the orbital period by an angle >26°. This causes changes in the characteristics of the atmosphere, leading to seasonal variations. The existing eccentricity of the orbit leads to a 21% greater energy inflow in the northern hemisphere, because close to the summer solstice for the northern h...
Article
Full-text available
Earth’s climate changes are the result of natural changes in the energy balance of Sun irradiation and influence of anthropogenic factors on the variations of ozone layer thickness and stratospheric aerosol abundance. It is developed a miniature polarimeter for satellite polarimetric experiments in the ultraviolet region of the sunlight spectrum. T...
Conference Paper
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For colorimetric analysis an image of Leonid-6230 meteor was used, obtained by Mike Hankey in 2012. It allows to determine its temperature, chemical composition and other characteristics.
Preprint
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This article describes our approach to quantifying the characteristics of meteors such as temperature, chemical composition, and others. We are using a new approach based on colourimetry. We analyze an image of Leonid meteor-6230 obtained by Mike Hankey in 2012. Analysis of the temporal features of the meteoroid trail is performed. For determining...
Article
Full-text available
A method for detecting the major aerosol modes in an atmospheric column and recovering the probable values of the microphysical parameters of their particles from the spectral phase dependences of the sky linear polarization degree has been proposed. A test processing of sky polarization measurements over the location site of the Main Astronomical...
Preprint
Full-text available
This article describes our approach to quantifying the characteristics of meteors such as temperature, chemical composition, and others. The program includes new algorithms for estimating temperature, heat radiation emitted by a fireball, and spectra of meteors containing emission lines. We are using a new approach based on colorimetry. We analyse...
Conference Paper
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The work relates to the field of general mechanical engineering and instrument making. It concerns the worm gear, which can be used in drives for technological, transport, and instrument-making machines of a wide range of purposes.
Conference Paper
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It is proposed to measure the polarization of light scattered by the atmosphere in the UV range of the spectrum from the Earth's orbit, which will eliminate the influence of the troposphere and the surface of our planet on the measurement results. A working model of a miniature space UV polarimeter has been developed and manufactured for a possible...
Conference Paper
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The influence of solar activity on grain yield is considered, taking into account 11-year and 22-year cycles of solar activity.
Conference Paper
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Ways to replenish the Earth's bioresource at the expense of the Moon are proposed.
Conference Paper
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One of the variants of heat supply of permanent bases on the Moon is considered.
Conference Paper
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The dangers that await humanity when migrating to Mars are considered. It offers efficient placement and equipment of permanent bases on the red planet.
Chapter
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Neptune-the eighth (farthest from Earth) planet of the Solar system, the fourth largest in size, the third largest in mass, among the planets of the Solar system. It belongs to the type of giant planets and the subclass of "ice giants". Neptune is the first planet in the solar system to be discovered by mathematical calculations. Under the upper la...
Article
The equator of Saturn is inclined to the orbital plane by an angle of 26.75°, and the period of revolution around the Sun is 29.45 years. Since the orbital eccentricity of Saturn is e ≈ 0.056 and Saturn passes the perihelion and the aphelion during the summer epoch in its southern and northern hemispheres, respectively, the southern hemisphere rece...
Article
Full-text available
The equator of Saturn is inclined to the orbital plane at an angle of 26.75° with a period of revolution around the Sun of 29.45 years. Due to the eccentricity of the e=0.056 orbit, its southern hemisphere receives 25% more energy from the Sun than the northern one, since the perihelion of orbit – Saturn passes during the summer epoch in the southe...
Article
Full-text available
This paper presents an example of the application of theoretical developments on some issues of physics of space invasion. The effect of brightness oscillations and “wobbling” in the meteor trail, which we discovered, allows us to obtain estimates of some characteristics of the meteor by measuring the frequency of changes in the brightness in the t...
Article
Full-text available
The presence of planets around the stars has long been predicted. And the stars are distant suns and there are many unknown objects around them. According to probability theory, it follows that our solar system is not a unique formation. It is estimated that up to 1 million planetary systems are formed in the universe every hour. And only modern as...
Conference Paper
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Celestial bodies need to be transformed in order to become suitable for long-term habitation there. To this end, a methodology should be developed for the construction of special settlements on small bodies. Asteroids approaching the Earth are the primary objects for such purposes. An important element in solving such problems should be the creatio...
Conference Paper
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The minerals and volatile elements that are in the composition of the substance of asteroids and cometary nuclei may contain nickel, iron, titanium and minerals containing water. Asteroids approaching our planet are among the most important objects for their possible industrial use. Many of the asteroids are covered with fragments formed during the...
Conference Paper
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The theme of space exploration and the colonization of other worlds are based on their terraforming. Our satellite is the most acceptable target, since it is close to us, several manned missions have already been landed there, and we also have a significant amount of information about this object. The design bureau Yuzhnoe (Ukraine) is also working...
Conference Paper
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At flying to Mars, astronauts lose protection by the magnetic field of our planet. Therefore, for a year and a half of flight to Mars and back, an astronaut can receive the maximum dose of radiation for his entire space career. For such a long time, a flash may occur on the Sun, and the radiation dose received by the astronaut will significantly in...
Conference Paper
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We propose using of polarimetric studies in the solar spectrum ultraviolet (UV) range to determine the characteristics of Earth’s atmosphere aerosols. A number of aerosol parameters like the real part of the refractive index of aerosol particles, the effective size, size distribution function and horizontal inhomogeneous of the altitudinal ozone la...
Conference Paper
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We proposed the reconstructing method for physical parameters of main aerosol modes in the Earth’s atmosphere from measurements of spectral phase dependences the degree of linear polarization (DoLP) of the sky. The main highlight of this method is the way for determining a relative contribution of Rayleigh scattering and weight coefficients of mode...
Conference Paper
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After meeting with Pluto, the spacecraft "New Horizons" (NH) headed to a 1.6 billion km further to a small object with the number 486958 and marked 2014 MU69 ("Ultima" - "Thule"). This is a small asteroid, which is a transneptunian object from the Kuiper belt, which was discovered by means of HST during the upcoming 2014 search of the future goal o...
Conference Paper
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In recent years interest has grown in the results of biological studies of astromaterials. The main source of such biological information is meteorites, which belong to the class of carbonaceous chondrites. For solutions of these issues need to develop a clear concept for detecting possible nano-vesicles in micrometeorites. We believe that such ast...
Conference Paper
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On the Moon, large amounts of various resources have already been discovered, starting with gases, water, minerals, and ending with metals and helium-3 were found there. It is potentially interesting in use as a fuel in nuclear fusion. The amount of helium-3 available can be measured in hundreds of millions of tons. And its development can be done...
Conference Paper
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About relocation of people on other cosmic bodies will make to think then, when will threat for existence of Earth. Karl Sagan at one time proposed for the future salvation of mankind an idea to transform and then colonize comets in the Solar System, by using the latest and most promising technology, and then to redirected it’s on the orbits necess...
Conference Paper
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According to the main hypothesis, Psyche is large metal fragment of the protoplanet core, which at the early stage of the formation of the Solar System collapsed during collision with another celestial body. This asteroid consists of elements similar to the iron-nickel core of the Earth, and a small number of pyroxenes. There are signs of the prese...
Conference Paper
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It is inevitable that minerals should be mined in space. In order to make a conclusion about the feasibility of starting the extraction of a certain natural resource in a certain place in outer space, it is necessary to consider the technology of its extraction. Exploration of resources in space should help the development of appropriate mining tec...
Conference Paper
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Meteoric events are space invasions, which appear at heights 115-65 km, and disappear at 100-45 km and lower. Most meteors are formed by meteoroid bodies of very small sizes, which at a speed of 11 to 72 km/s at high altitudes begin to interact with the earth's atmosphere. The brightness and spectrum of meteors make it possible to estimate the size...
Conference Paper
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We consider the motion of a meteor within the framework of the dynamics of a compressible gas using the example of the motion of a piston with constant velocity in a cylinder with gas. Movement of gas behind the piston is accompanied by an unsteady rarefaction wave. Our estimates allow us to conclude that practically all space invasions of both met...
Conference Paper
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Scientific studies have shown that there is an ocean of liquid water beneath Europa's surface. The presence of a liquid ocean under the ice crust automatically makes this satellite a candidate for habitable worlds. At satellite also found evidence of the existence of tectonic plates and their movement. Irradiation of Europa's surface saturates the...
Conference Paper
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The study of meteoroid material will help answer many questions about the origin of the universe. We propose to take samples of meteoroid matter directly in space. Meteoric matter is space dust particles, fragments of asteroids and cometary nuclei. Constant meteor showers repeat annually. For example, the remnants of Halley's comet form meteoroids...
Conference Paper
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The nighttime observations of Lyrid meteor shower carried out by us in April 2018 made it possible for the first time to reveal changes in the brightness of meteors during flyby in fractions of seconds. Analysis of images of a faint meteor showed that for 0.3 s its brightness changes with a frequency of about 6 Hz with an amplitude of about 0.001 m...
Conference Paper
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Most of the meteoric events end in an explosion. The explosion or destruction of a meteoroid occurs when the centrifugal force arising during rotation becomes equal to the normal force, which determines the ultimate strength of the material of which the meteoroid consists. Equating the force of Magnus and the centrifugal force of rotation, we estim...
Conference Paper
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At about 10:30 AM of 02/28/2020 a meteoroid appeared in the atmosphere over Croatia (Karlovac) and Italy (Fano) at an altitude of about 20 km; the traced path was about 300 km. The flight of the meteoroid was accompanied by decay, flashes of brightness and loud sound. The meteor was leaving a rapidly disappearing con trail on a clear sky. The conto...
Conference Paper
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Temperatures on Enceladus are 85-90 K, but there are small polar areas with temperatures up to 157 K. In the depths of the ocean, hydrothermal springs can be located, heating water to almost +90 °C. Such a high temperature under the surface of Enceladus can be explained by the tidal heating of the satellite from Saturn. Several mechanisms have been...
Conference Paper
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An obtained images with Voyager and Cassini spacecrafts cameras and detailed map of the surface of Diona indicates geological changes on its surface and of recent geological activity. After conducting gravitational topological analysis using modern methods, it was possible to obtain reliable evidence of the presence of the ocean under the surface o...
Conference Paper
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The trajectory of meteoroid body depends on its shape. During the movement of that bodies, deviations from the rectilinear trajectory ("wobbling"). Deviations from rectilinear motion indicate the presence of a force perpendicular to the direction of the flight path (Magnus effect). The lifting force of Magnus occurs when a body of arbitrary shape r...
Conference Paper
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In 2016, NASA launched spacecraft, directing it to the near-Earth asteroid Bennu crossing the Earth's orbit; the period of its revolution around the Sun is 1.2 Earth years. Asteroid belongs to the class C of carbon asteroids. The device reached it in October 2018. Initially, this body was studied by spectral methods, and the most optimal place for...
Conference Paper
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Powerful insufficiently studied atmosphere closes access to the surface of Venus and significantly complicates its study. However, polarimetric research methods allow to successfully study the gaseous component of the atmosphere and aerosol components of its clouds. One of the scientific directions of some projects is the study of the atmosphere of...
Conference Paper
There are described the main ways of the light modulation in polarized components for astronomical polarimeters obtaining. Attention is focused on the construction of polarizing hollow-rotor modulators. The possibility of a new multifunctional polarization modulator creating for astronomical research based on a piezoelectric motor with a hollow rot...
Conference Paper
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Space countries have once again begun to develop programs to study the surface of the moon. For the first time since the Apollo missions, NASA is developing new special suits for the safe stay of astronauts on the surface of the Satellite. The beginning of the Artemis missions themselves is scheduled for 2024. If the whole mission is for 2-4 weeks,...