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Author |
Moreau M., Laffly D., Joly D. & Brossard T. |
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Title  |
Analysis of plant colonization on an arctic moraine since the end of the Little Ice Age using remotely sensed data and a Bayesian approach. |
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Journal Article |
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Year |
2005 |
Publication |
Remote sensing of environment |
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Volume |
99 |
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Pages |
244-253 |
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400 |
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0034-4257 |
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yes |
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Serial |
3152 |
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Author |
Marx J.C. & Feller G. |
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Title |
Analysis of Ser-His-Glu triad in alpha-amylases. |
Type |
Conference - International - Poster |
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2006 |
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Inter. Conf. on Alpine and Polar Microbiology, Inn |
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193 |
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yes |
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Serial |
3934 |
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Author |
Bruno-Charles Busseau, Alain Royer, Alexandre Roy, Alexandre Langlois, Florent Domine |
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Title |
Analysis of snow-vegetation interactions in the low Arctic-Subarctic transition zone (northeastern Canada) |
Type |
Journal |
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Year |
2017 |
Publication |
Physical Geography |
Abbreviated Journal |
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Volume |
38 |
Issue |
2 |
Pages |
159-175 |
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Keywords |
Normalized Difference Snow Index north-eastern Canada snow depth Snow remote sensing snowmelt trapping effect |
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Programme |
1042 |
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ISSN |
0272-3646 |
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0272-3646 |
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yes |
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Serial |
6904 |
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Author |
G. Hubert, S. Aubry |
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Title |
Analysis of Solar and Galactic Cosmic Rays Induced Atmospheric Ionizing Radiation: Impacts for Typical Transatlantic Flights and Antarctica Environment |
Type |
Journal |
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Year |
2017 |
Publication |
Jsm environmental science & ecology |
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Volume |
5 |
Issue |
3 |
Pages |
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Abstract |
This paper analyses atmospheric ionizing radiations induced by Galactic and Solar Cosmic Rays (GCR and SCR, respectively) thanks to continuous measurements of neutron spectrum operated in high-altitude stations. Analyses are reinforced using GCR and SCR models, and extensive air shower descriptions
based on nuclear transport simulations. First analyses were focused on neutron fluxes as function of altitude. Secondly, atmospheric ionizing radiation impacts on biological doses during quiet period and extreme solar events are presented. On the basis of the relevant comparisons conducted for ambient dose equivalent
during quiet solar activity, but also for the comic ray variations calculated and recorded on neutron monitor (NM) during Ground Level Enhancement (GLE) event. GLE 5 model was applied to London ↔ New-york flight dose calculations. All of these results show that dose values vary drastically, on the one hand with the route path (latitude, longitude altitude), on the other hand with the phasing of the solar event. Specific case of Antarctica is discussed because it combines both the high altitude and the very low magnetic field. Analyses show that ionizing radiation in Antarctica environment can be a problematic from the point of view of the human dose, which exerts classical recommendations established for public. This highlights the importance of monitoring atmospheric ionizing radiation, more particularly extreme solar events, then to develop semi-empirical and particle transport method for reliable calculation of dose levels. |
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1112 |
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ISSN |
2333-7141 |
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Approved |
yes |
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Call Number |
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Serial |
7433 |
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Title |
Analysis of the angular distribution of cosmic-ray-induced particles in the atmosphere based on Monte Carlo simulations including the influence of the Earth's magnetic field |
Type |
Journal |
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Year |
2017 |
Publication |
Astroparticle Physics |
Abbreviated Journal |
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Volume |
97 |
Issue |
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Pages |
106-117 |
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Keywords |
Angular distribution of the extensive air shower Flight altitude Monte Carlo method simulation South Atlantic Magnetic Anomaly |
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Abstract |
Several applications exist that calculate cosmic-ray-induced particle (CRIP) spectra as a function of the altitude in the atmosphere. In general, the Earth's magnetic field is only used to modulate the primary cosmic radiation that arrives at the top of the atmosphere, but it can also modulate low-energy charged particles at flight altitudes. The effects of the Earth's magnetic field on the angular distributions of CRIP transport in the atmosphere should be quantified, because it furnishes important data for the development of applications for aircrew radiation protection, onboard dosimetry and the simulation of irradiation of sensitive equipment and particle detector systems used at ground level, flight and atmospheric balloon altitudes. In this work we calculate the angular distribution of the cosmic-ray-induced particles (CRIP) for altitudes from ground level up to 80?km using an application based on Geant4 developed in previous works. In order to quantify the effects of the Earth's magnetic field (EMF) on the angular distribution of the CRIP, the calculations were carried out both including the EMF in the South Atlantic Magnetic region and omitting it. A part of these results were compared with analytical calculations of the ratio between the mean free path of the primary particles from the cosmic radiation and the deflection radii at different altitudes in the atmosphere. The albedos of neutrons and protons at 80?km were estimated and compared with the QARM and ATMORAD codes, which ignore the Earth's magnetic field. |
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Programme |
1112 |
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Series Volume |
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Edition |
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ISSN |
0927-6505 |
ISBN |
0927-6505 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
6726 |
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| Permanent link to this record |
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Author |
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Title |
Analysis of the angular distribution of cosmic-ray-induced particles in the atmosphere based on Monte Carlo simulations including the influence of the Earth's magnetic field |
Type |
Journal |
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Year |
2018 |
Publication |
Astroparticle Physics |
Abbreviated Journal |
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Volume |
97 |
Issue |
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Pages |
106-117 |
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Keywords |
Angular distribution of the extensive air shower Flight altitude Monte Carlo method simulation South Atlantic Magnetic Anomaly |
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Abstract |
Several applications exist that calculate cosmic-ray-induced particle (CRIP) spectra as a function of the altitude in the atmosphere. In general, the Earth's magnetic field is only used to modulate the primary cosmic radiation that arrives at the top of the atmosphere, but it can also modulate low-energy charged particles at flight altitudes. The effects of the Earth's magnetic field on the angular distributions of CRIP transport in the atmosphere should be quantified, because it furnishes important data for the development of applications for aircrew radiation protection, onboard dosimetry and the simulation of irradiation of sensitive equipment and particle detector systems used at ground level, flight and atmospheric balloon altitudes. In this work we calculate the angular distribution of the cosmic-ray-induced particles (CRIP) for altitudes from ground level up to 80?km using an application based on Geant4 developed in previous works. In order to quantify the effects of the Earth's magnetic field (EMF) on the angular distribution of the CRIP, the calculations were carried out both including the EMF in the South Atlantic Magnetic region and omitting it. A part of these results were compared with analytical calculations of the ratio between the mean free path of the primary particles from the cosmic radiation and the deflection radii at different altitudes in the atmosphere. The albedos of neutrons and protons at 80?km were estimated and compared with the QARM and ATMORAD codes, which ignore the Earth's magnetic field. |
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Programme |
1112 |
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ISSN |
0927-6505 |
ISBN |
0927-6505 |
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Approved |
yes |
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Call Number |
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Serial |
7042 |
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Author |
G. Hubert, M. T. Pazianotto, C. A. Federico, P. Ricaud |
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Title |
Analysis of the Forbush Decreases and Ground-Level Enhancement on September 2017 Using Neutron Spectrometers Operated in Antarctic and Midlatitude Stations |
Type |
Journal |
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Year |
2019 |
Publication |
Journal of Geophysical Research: Space Physics |
Abbreviated Journal |
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Volume |
124 |
Issue |
1 |
Pages |
661-673 |
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Abstract |
This work investigates solar events occurred in September 2017 characterized by a series of Forbush decreases and a ground level enhancement (GLE). Forbush decreases is a rapid decrease in the observed https://en.wikipedia.org/wiki/Galacticcosmicray intensity following a coronal mass ejection while GLE is induced by a strong solar event for which the flux of high-energy solar particles is sufficient to enhance the radiation level on the ground. These investigations were performed using data recorded by a neutron spectrometer network composed of a Bonner sphere system. Two instruments located at Pic-du-Midi Observatory (+2,885 m above sea level) and at Concordia station (Antarctica, +3,233 m) record simultaneously and continuously the neutron spectra, allowing to consider short-term variations during solar events. The main objective is to analyze neutron spectral properties including their energy distributions and dynamics. This paper presents cosmic ray-induced neutron spectra during active solar event leading to changes in the local cosmic ray spectrum (Forbush decreases and a GLE). Concerning the GLE, analyses show that neutrons in the evaporation domain are particularly amplified during the GLE, while other energetic domains increase uniformly. |
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Programme |
910,1112 |
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Thesis |
Bachelor's thesis |
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ISSN |
2169-9402 |
ISBN |
2169-9402 |
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yes |
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Call Number |
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Serial |
7556 |
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Author |
Van de Vijver B, Wetzel C, Kopalova K, Zidarova R, Ector L |
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Title |
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Type |
Journal Article |
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Year |
2013 |
Publication |
FOTTEA |
Abbreviated Journal |
1802-5439 |
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Volume |
13 |
Issue |
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Pages |
105-117 |
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Programme |
136 |
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ISSN |
1802-5439 |
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yes |
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Call Number |
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Serial |
4386 |
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Author |
Van de Vijver Bart, |
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Title |
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Type |
Journal Article |
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Year |
2014 |
Publication |
Phytotaxa |
Abbreviated Journal |
1179-3155 |
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Volume |
184 |
Issue |
3 |
Pages |
139-139 |
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Keywords |
Brachysira, Iles Kerguelen, Navicula brachysira, morphology, new species, sub-Antarctica, |
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Abstract |
During a study of the freshwater diatom flora of some hot springs on the sub-Antarctic Kerguelen Islands, an unknown Brachysira species was observed. Detailed morphological analysis using both light and scanning electron microscopy observations revealed sufficient morphological differences to separate this species as Brachysira sandrae sp. nov. The new species belongs to the complex of taxa around B. brebissonii . The type material of Navicula brachysira , most likely the type of B. brebissonii , was studied to reveal its morphological ultrastructure. The new species is compared with B. brebissonii and with similar Brachysira taxa worldwide.
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136 |
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1179-3155 |
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yes |
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Call Number |
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Serial |
5752 |
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Author |
Van de Vijver Bart, Moravcova Adela, Kusber Wolf-Henning, Neustupa Jiri, |
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Title |
Analysis of the type material of Pinnularia divergentissima (Grunow in Van Heurck) Cleve (Bacillariophyceae)
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Type |
Journal Article |
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Year |
2013 |
Publication |
FOTTEA |
Abbreviated Journal |
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Volume |
13 |
Issue |
1 |
Pages |
1-14 |
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136 |
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CZECH PHYCOLOGICAL SOC BENATSKA 2,, PRAHA 2, CZ-128 01, CZECH REPUBLIC |
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1802-5439 |
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yes |
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Call Number |
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Serial |
4801 |
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