José L. Gasent-Blesa

University of Valencia | UV

The Polarimetric and Helioseismic Imager on board the Solar Orbiter mission (SO/PHI) offers refocusing capabilities to cope with the strongly varying thermal environment of the optical system along the spacecraft's elliptical orbit. The series of images recorded during in-flight focus calibrations can be employed for phase diversity analyses. In th...

Traditionally, the observation time needed to build synoptic maps of the solar magnetic field is bound to the 27 days of a full Carrington rotation due to the single viewpoint from Earth. Our aim is to reduce this observation time to 13.5 days by combining magnetograms from two vantage points, 180 degrees apart in longitude in the ideal case. We co...

The brightness of faculae and network depends on the angle at which they are observed and the magnetic flux density. Close to the limb, assessment of this relationship has until now been hindered by the increasingly lower signal in magnetograms. This preliminary study aims at highlighting the potential of using simultaneous observations from differ...

Earth-side observations of solar p modes can be used to image and monitor magnetic activity on the Sun's far side. Here we use magnetograms of the far side obtained by the Polarimetric and Helioseismic Imager (PHI) onboard Solar Orbiter (SO) to directly assess -- for the first time -- the validity of far-side helioseismic holography. We wish to co-...

In order to make accurate inferences about the solar interior using helioseismology, it is essential to understand all the relevant physical effects on the observations. One effect to understand is the (complex-valued) ratio of the horizontal to vertical displacement of the p- and f-modes at the height at which they are observed. Unfortunately, it...

The ESA/NASA Solar Orbiter space mission has been successfully launched in February 2020. Onboard is the Polarimetric and Helioseismic Imager (SO/PHI), which has two telescopes, a High Resolution Telescope (HRT) and the Full Disc Telescope (FDT). The instrument is designed to infer the photospheric magnetic field and line-of-sight velocity through...

The Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft observed small extreme ultraviolet (EUV) bursts, termed campfires, that have been proposed to be brightenings near the apexes of low-lying loops in the quiet-Sun atmosphere. The underlying magnetic processes driving these campfires are not understood. During the cruise...

Joaquín Rieta Síster (Valencia, 1897-1982) is one of the leading exponents of Valencian architecture in the middle decades of the 20th century. His recognition is mainly confined to the rationalist works of the 1930s. Less well known, however, is his "other" architecture, that built after the Spanish Civil War and often ignored from the point of vi...

Flipped classroom and just-in-time learning, with the support of bring your own device, are learning methodologies in which the student, instead of passively receiving the content, discovers the concepts and their relationships and rearranges them to suit his cognitive schema. Co-creatively discovering the most complex and changing concepts through...

The Banda Primitiva de Llíria is presented as an open heritage resource, which has been built on the uses, values and symbols assigned to it by the local town of Llíria and its inhabitants over the musical society’s two centuries of history. This work focuses on analysing how this musical phenomenon contributes to positioning creativity and cultura...

Within the scientific goals of the THESEUS ESA/M5 candidate mission, a critical item is a fast (within a few s) and accurate (<15 arcmin) Gamma-Ray Burst and high-energy transient location from a few keV up to hard X-ray energy band. For that purpose, the signal multiplexing based on coded masks is the selected option to achieve this goal. This con...

THESEUS is one of the three missions selected by ESA as fifth medium class mission (M5) candidates in its Cosmic Vision science program, currently under assessment in a phase A study with a planned launch date in 2032. THESEUS is designed to carry on-board two wide and deep sky monitoring instruments for X/gamma-ray transients detection: a wide-fie...

The XGIS (X and Gamma Imaging Spectrometer) is one of the three instruments onboard the THESEUS mission (ESA M5, currently in Phase-A). Thanks to its wide field of view and good imaging capabilities, it will efficiently detect and localize gamma-ray bursts and other transients in the 2-150 keV sky, and also provide spectroscopy up to 10 MeV. Its cu...

Theaters and auditoriums are one of the most important equipment in a city. The main parameter which determines the adaptation of theaters and halls to their intended activity is the reverberation time. It depends on the shape and size of the enclosure, the materials used in the construction of the enclosure and the way they are built. The absorp...

Aims. This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseis- mology instrument to observe the Sun from outside the Sun-Earth line. It is the key instrument meant to address the top-level science question: How does the solar dynamo work and drive connections between...

This paper presents the thermal design of the electronics unit of the instrument Polarimetric Helioseismic Imager, onboard the European Space Agency mission Solar Orbiter. The thermal design procedure, along with the problems encountered during this design phase, and the solutions found to fix them are described, proving in this way the thermal fea...

This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseismology instrument to observe the Sun from outside the Sun-Earth line. It is the key instrument meant to address the top-level science question: How does the solar dynamo work and drive connections between the Sun...

Aims. This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseis- mology instrument to observe the Sun from outside the Sun-Earth line. It is the key instrument meant to address the top-level science question: How does the solar dynamo work and drive connections between...

Frequency Response and Random analyses are mandatory on space projects, however commercial Finite Element Method (FEM) software is usually general-purpose and only provides raw results. Therefore, these outputs have to be subjected to additional handling with customized programs to obtain the final ad-hoc reports. Input profiles are frequently upda...

We present a software simulator for the modeling of astronomical instrumentation, which includes platform effects and software processing. It is an end-to-end simulator, from the entrance of the telescope to the data acquisition at the detector, along with software blocks dealing, e.g., with demodulation, inversion, and compression. Developed follo...

The SUNRISE balloon-borne solar observatory, consisting of a 1~m aperture telescope that provided a stabilized image to a UV filter imager and an imaging vector polarimeter, carried out its second science flight in June 2013. It provided observations of parts of active regions at high spatial resolution, including the first high-resolution images i...

When using a single DC/DC converter with multiple outputs and having a buck topology, which has one filter inductor per output, the designer can choose to couple these outputs together. This paper demonstrates additional benefits of coupling output inductors together. Apart from saving mass and volume, and due to an improved small signal behaviour...

This paper calculates the failure rate on reversed polarized silicon diodes with the aim to justify, experimentally, the rules of the European Space Agency (ESA) which are referred to the component life’s extension, the reliability increase and the end of life performance enhancement, by using oversized devices (derating rules). In order to verify...

Coupling output inductors is a very popular solution when designing a multiple-output DC/DC system. Space-borne circuits are one of the areas where a custom DC/DC converter design with coupled inductors could be preferred to have a detailed design of all variables. Output voltage regulation can be improved using coupled output inductors on a multip...

XIPE, the X-ray Imaging Polarimetry Explorer, is a mission dedicated to X-ray Astronomy. At the time of writing XIPE is in a competitive phase A as fourth medium size mission of ESA (M4). It promises to reopen the polarimetry window in high energy Astrophysics after more than 4 decades thanks to a detector that efficiently exploits the photoelectri...

Space missions have very stringent mass, volume and also power budgets. This requires very precise knowledge of the power consumption of the whole satellite, not only peak power but also static and long term dynamic power. This calculation becomes very complex if all the operational modes (long term dynamic changes) are taken into account, includin...

This work shows the design procedure followed to build the Power Converter Module (PCM) for the Polarimetric and Helioseismic Imager (PHI), experiment on board the Solar Orbiter Satellite (SolO). The selected topology has been a Push-Pull, for a power level of approximately 35 W and with seven output voltages. Coupled inductors between all outputs...

Space missions have very stringent budgets, not only related to mass and volume, but also to power. This requires very precise knowledge of the power consumption of the whole satellite. This calculation becomes very complex if all the operational modes are taken into account, including the different environmental situations (mainly temperature vari...

Power converters for experiments that have to fly on board space missions (satellite, launchers, etc.) have very stringent requirements due to its use in a very harsh environment. The selection of a suitable topology is therefore not only based on standard requirements but additional more strict ones have also to be fulfilled. This work shows the d...

The first science flight of the balloon-borne Sunrise telescope took place in June 2009 from ESRANGE (near Kiruna/Sweden) to Somerset Island in northern Canada. We describe the scientific aims and mission concept of the project and give an overview and a description of the various hardware components: the 1-m main telescope with its postfocus scien...

The Imaging Magnetograph eXperiment (IMaX) is a spectropolarimeter built by four institutions in Spain that flew on board the Sunrise balloon-borne telesocope in June 2009 for almost six days over the Arctic Circle. As a polarimeter IMaX uses fast polarization modulation (based on the use of two liquid crystal retarders), real-time image accumulati...

IMaX is the Imaging Magnetograph eXperiment, an instrument part of the payload of SUNRISE, a stratospheric balloon mission in Antarctica. It is also the precursor of the Visible Imaging Magnetograph of the future ESA Solar Orbiter mission. It is essentially a diffraction-limited imager that carries out spectropolarimetric measurements of high resol...

In this work, it is described the Imaging Magnetograph eXperiment, IMaX, one of the three postfocal instruments of the Sunrise mission. The Sunrise project consists on a stratospheric balloon with a 1 m aperture telescope, which will fly from the Antarctica within the NASA Long Duration Balloon Program. IMaX will provide vector magnetograms of the...

The high-angular resolution imager IBIS is one of the two main instruments aboard the ESA INTEGRAL satellite launched in October 2002. IBIS uses coded aperture mask technique in order to provide the required imaging capabilities for energies between 15 and 10 MeV.The precise knowledge of the coded mask response function critically determine the IBI...

The SUNRISE balloon project is a high-resolution mission to study solar magnetic fields able to resolve the critical scale of 100 km in the solar photosphere, or about one photon mean free path. The Imaging Magnetograph eXperiment (IMaX) is one of the three instruments that will fly in the balloon and will receive light from the 1m aperture telesco...

The SUNRISE balloon project is a high-resolution mission to study solar magnetic fields able to resolve the critical scale of 100 km in the solar photosphere, or about one photon mean free path. The Imaging Magnetograph eXperiment (IMaX) is one of the three instruments that will fly in the balloon and will receive light from the 1m aperture telesco...

The high-resolution γ-ray spectrometer (SPI) is one of the two main instruments on board the ESA INTEGRAL satellite successfully launched in October 2002. SPI uses coded aperture mask technique in order to have imaging capabilities at the energy band (20 keV–8 MeV) it will study celestial sources. The SPI imaging performance depends critically on t...

The ESA INTErnational Gamma Ray Astrophysical Laboratory (INTEGRAL) was selected in 1994 as a medium size scientific mission in ESA Horizon 2000 Programme. INTEGRAL main scientific goal is to perform fine spectroscopy and imaging of celestial gamma-ray sources in the energy range from 15 keV to 10 MeV. INTEGRAL payload consists of two main gamma-ra...

The goal of this paper is to present the Transmission Matrix of the SPI Mask STM/QM Model. The experimental set-up used to determine INTEGRAL Spectrometer (SPI) Mask Transmission Matrix is hereafter described: collimation system, radioactive sources, energy ranges covered and pitch angles covering the expected SPI Field of View. The QM results fulf...

The JEM-X Signal Multiplexing Systems are large HURA codes "written" in a pure tungsten plate 0.5 mm thick. 24.247 hexagonal pixels (25% open) are spread over a total area of 535 mm diameter. The tungsten plate is embedded in a mechanical structure formed by a Ti ring, a pretensioning system (Cu-Be) and an exoskeleton structure that provides the re...

The ESA INTErnational Gamma Ray Astrophysical Laboratory (INTEGRAL) satellite is the largest Gamma-Ray Astrophysics mission foreseen for this decade. Since its selection in 1994, three very innovative technologies were identified to achieve the INTEGRAL scientific goals: new generation Solid State Detectors, Active Veto Systems and Spatial Signal M...

Coded Masks provide the Signal Multiplexing tools for the High Energy Instrumentation of the INTErnational Gamma Ray Astrophysics Laboratory (INTEGRAL) ESA Project addressed to fine imaging of celestial gamma ray sources. Milestones on its development are described in the paper by Reglero et al in this Seminar. The aim of this paper is to summarise...

The ESA INTErnational Gamma Ray Astrophysical Laboratory (INTEGRAL) satellite is the largest Gamma-Ray Astrophysics mission foreseen for this decade. Since its selection in 1994, three very innovative technologies were identified to achieve the INTEGRAL scientific goals: new generation Solid State Detectors, Active Veto Systems and Spatial Signal M...

Coded Aperture System performances are defined by the geometry of the code, detector pixel geometry relationship and focal length. Physical Coded Aperture Systems deviate from the ideal ones on two basic aspects: uncertainties on pixel location and size coming form the manufacturing process and deviations from their theoretical transparency/opacity...