Alexandre SimoneauUniversité de Sherbrooke | UdeS
Alexandre Simoneau
M.Sc. Physics
About
19
Publications
4,182
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
124
Citations
Citations since 2017
Introduction
Publications
Publications (19)
The spatial and angular emission patterns of artificial and natural light emitted, scattered, and
reflected from the Earth at night are far more complex than those for scattered and reflected solar radiation
during daytime. In this commentary, we use examples to show that there is additional information contained
in the angular distribution of emit...
The spatial and angular emission patterns of artificial and natural light emitted, scattered, and reflected from the Earth at night are far more complex than those for scattered and reflected solar radiation during daytime. In this commentary, we use examples to show that there is additional information contained in the angular distribution of emit...
Citation: Marseille, C.; Aubé, M.; Barreto, A.; Simoneau, A. Remote Sensing of Aerosols at Night with the CoSQM Sky Brightness Data. Remote Sens. 2021, 13, 4623. https://doi. Abstract: Aerosol optical depth is an important indicator of aerosol particle properties and their associated radiative impacts. AOD determination is very important to achieve...
The aerosol optical depth is an important indicator of aerosol particle properties and associated radiative impacts. AOD determination is therefore very important to achieve relevant climate modeling. Most remote sensing techniques to retrieve aerosol optical depth are applicable to daytime given the high level of light available. The night represe...
Knowledge of the night sky radiance over a large region may be valuable information for identifying sites suitable for astronomical observations or for assessing the impact of artificial light at night on ecosystems. Measuring the sky radiance can be a complex endeavour, depending on the desired temporal and spatial resolution. Likewise, the modell...
Increased exposure to artificial light at night can affect human health including disruption 1 of melatonin production and circadian rhythms and extend to increased risks of hormonal cancers 2 and other serious diseases. In addition, multiple negative impacts on fauna and flora are well 3 documented, and it is a matter of fact that artificial light...
Increased exposure to artificial light at night can affect human health including disruption of melatonin production and circadian rhythms and extend to increased risks of hormonal cancers and other serious diseases. In addition, multiple negative impacts on fauna and flora are well documented, and it is a matter of fact that artificial light at ni...
The propagation of artificial light into real environments is complex. To perform its numerical modelling with accuracy, one must consider hyperspectral properties of the lighting devices and their geographic positions, the hyperspectral properties of the ground reflectance, the size and distribution of small-scale obstacles, the blocking effect of...
The propagation of artificial light into real environments is complex. To perform its numerical modelling with accuracy one must consider hyperspectral properties of the lighting devices and their geographic positions, the hyperspectral properties of the ground reflectance, the size and distribution of small-scale obstacles, the blocking effect of...
Night sky brightness over Montsec Observatory (north-east of Spain) has been computed and checked against measurements using Illumina numerical model [2]. In a previous publication [20] the methodology was validated and light pollution received in the observatory coming from a unique city was computed. Here we present a simulation that includes all...
Night protection has been a major concern for astronomers since the electrification of cities and is beginning to be recognized as a major environmental problem. In recent years, regulations have been put in place through the establishment of Dark Sky Reserves that impose stringent constraints on lighting practices for cities in protected areas. As...
Knowledge of the night sky radiance over a large territory may be valuable information to identify sites appropriate to astronomical observations or for asserting the impacts of artificial light at night on ecosystems. Measuring the sky radiance can be a complex endeavour depending on the desired temporal and spatial resolution. Similarly, modellin...
Night protection has been a major concern for astronomers since the electrification of cities and is beginning to be recognized as a major environmental problem. In recent years, regulations have been put in place through the establishment of Dark Sky Reserves that impose stringent constraints on lighting practices for cities in protected areas. As...
Artificial night sky brightness is a major issue that was first noted by astronomers decades ago. It is known to affect vast ecosystems, including humans. The study of the propagation of artificial light in the environment is key to understanding and controlling the impact we have as humans. Many numerical models have been developed to do so over t...
The goal of this study is to evaluate the current level of light pollution in the night sky at the Haleakala Observatory on the island of Maui in Hawaii. This is accomplished with a numerical model that was tested in the first International Dark Sky Reserve located in Mont-Mégantic National Park in Canada. The model uses ground data on the artifici...
Illumina is one of the most physically detailed artificial night sky brightness
model to date. It has been in continuous development since 2005. In 2016-17,
many improvements were made to the Illumina code including an overhead
cloud scheme, an improved blocking scheme for subgrid obstacles (trees and
buildings), and most importantly, a full hypers...
The radiation pressure exerted on sub-micrometer-size particles is shown to be an important factor predetermining the impact coordinates of the particles after being illuminated by a laser beam. Unlike spherical particles, the nonspherical ones can be deflected perpendicularly to the beam direction if the momentum transfer from the laser beam to a...
Transport experiments on the two-dimensional electron gas (2DEG) confined
into a semiconductor quantum well and subjected to a quantizing magnetic field
have uncovered a rich variety of uniform and nonuniform phases such as the
Laughlin liquids, the Wigner, bubble and Skyrme crystals and the quantum Hall
stripe state. Optically pumped nuclear magne...
Projects
Project (1)
In collaboration with the Canadian Space Agency (CSA) and the European Space Agency (ESA) in the framework of the STRATOS program, we launch multiple DSLR systems to observe the multiangular and spectral properties of the installed luminaires from an altitude of 36 km. STRATOS project consists of high altitude balloon flights to perform a variety of near space experiments. For HABLAN-I, two Sony A7S cameras were attached to a gimbal in order to assure a nadir pointing stability. The balloon took off at Timmins (ON, Canada) in August 2019 for its first flight. The experiment took place around the new moon. One of the two cameras is equipped with a 50mm lens, assuring the collection of high-resolution images (6 m per pixel). Data, such as multispectral radiance of light points and spectral type recognition, ground cover, and obstacles properties will be derived from this camera. The other camera is equipped with an 8mm fisheye lens so that the angular function of the luminaires will be sampled up to almost 90-degrees from zenith. Close to the flight, ground-based data were acquired. For instance, we used the LANcube multiangular and multispectral sensor in a roadrunner mode to map the light at night all over the overflown region. We also sampled the sky brightness with a third A7S camera with 24mm lens and a robotic mount.
