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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 |
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2019 |
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Journal of Geophysical Research: Space Physics |
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124 |
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1 |
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661-673 |
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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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910,1112 |
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Bachelor's thesis |
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2169-9402 |
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2169-9402 |
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7556 |
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Title |
Quality Assessment of the First Measurements of Tropospheric Water Vapor and Temperature by the HAMSTRAD Radiometer Over Concordia Station, Antarctica
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2013 |
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Geoscience and Remote Sensing, IEEE Transactions on |
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0196-2892 |
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PP |
Issue |
99 |
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1-23 |
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Extraterrestrial measurements, Instruments, Microwave radiometry, Ocean temperature, Temperature measurement, Terrestrial atmosphere, Water, Antarctica, atmospheric measurements, humidity measurements, least squares methods, microwave measurements, microwave radiometry, temperature measurements, time series analysis, |
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910,1013 |
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Bachelor's thesis |
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0196-2892 |
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yes |
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660 |
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Statistical analyses and correlation between tropospheric temperature and humidity at Dome C, Antarctica
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Journal Article |
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2014 |
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ANTARCTIC SCIENCE |
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Antarct. Sci. |
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26 |
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03 |
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290-308 |
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ground-based sensors,, , integrated water vapour, meteorological analyses, radiosonde, space-borne sensors, |
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910,1013 |
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Bachelor's thesis |
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0954-1020 |
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yes |
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4500 |
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Motte E. |
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2008 |
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910 |
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yes |
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4923 |
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Author |
Motte E., Ricaud P., Gabard B., Niclas M. & Gangneron F. |
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Title |
A 22 GHz Mobile Microwave Radiometer (MobRa) for the study of stratospheric water vapor |
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Journal Article |
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Year |
2008 |
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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING |
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Volume |
46 |
Issue |
10 |
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3104-3114 |
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910 |
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Bachelor's thesis |
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0196-2892 |
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yes |
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4924 |
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Title |
VALIDATION OF TROPOSPHERIC WATER VAPOUR AS MEASURED BY THE 183-GHZ RADIOMETER HAMSTRAD WITH IASI AND SONDES OVER THE PYRENEES MOUNTAINS, FRANCE, 2nd EPS/Metop RAO Workshop, Barcelona, Spain, May 2009. |
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Conference - International - Article without Reading Comitee |
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2009 |
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910 |
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5690 |
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The 183-GHz HAMSTRAD-Tropo Radiometer: Validation over the Pyrenees mountains (France) and first measurements at Dome C (Antarctica), 2009 IEEE IGARSS Conference, Cape Town, South Africa, 13-17 July 2009. |
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Conference - International - Article with Reading Comitee |
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2009 |
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910 |
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5691 |
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Author |
RICAUD Philippe, GABARD Benjamin, DERRIEN Sol, CHABOUREAU Jean-Pierre, ROSE Thomas, MOMBAUER Andreas, CZEKALA Harald, |
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Title |
HAMSTRAD-Tropo, A 183-GHz Radiometer Dedicated to Sound Tropospheric Water Vapor Over Concordia Station, Antarctica |
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Journal Article |
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Year |
2010 |
Publication |
IEEE transactions on geoscience and remote sensing |
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Volume |
48 |
Issue |
3 |
Pages |
16 |
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Keywords |
Atmospheric measurements, humidity measurement, microwave measurements, microwave radiometry, Europe, Europe, Western Europe, Europe Ouest, polar regions, R, France, France, Antarctica, Antarctique, radiometry, Radiom, atmosphere, Atmosph, models, Mod, sounding, Sondage, humidity, Humidit, accuracy, Pr, temperature, Temp, oxygen, Oxyg, technology, Technologie, domes, Dome, programs, Programme, microwaves, Hyperfr, water vapor, Vapeur eau, |
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910 |
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Bachelor's thesis |
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Institute of Electrical and Electronics Engineers |
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New York, NY, ETATS-UNIS |
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0196-2892 |
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yes |
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50 |
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Author |
Ricaud, P. Gabard, B. Derrien, S. Attie, J.-L. Rose, T. Czekala, H. |
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Title |
Validation of tropospheric water vapor as measured by the 183-GHz HAMSTRAD Radiometer over the Pyrenees Mountains, France |
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Journal Article |
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Year |
2010 |
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IEEE Geoscience and Remote Sensing Society |
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48 |
Issue |
5 |
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2189-2203 |
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The H2O Antarctica Microwave Stratospheric and Tropospheric Radiometers (HAMSTRAD) 183-GHz radiometer has been developed to measure vertical profiles of tropospheric water vapor above Dome C (Concordia station), Antarctica ( 75?06'S, 123?21'E, 3233 m asml), which is an extremely cold and dry environment, over decades. Prior to its installation at Dome C in January 2009, the instrument was deployed at the Pic du Midi (PdM) station ( 42?56'N, 0?08'E, 2877 m asml) in the Pyrenees Mountains, France, over the period covering February-June 2008. Vertical profiles of absolute humidity and integrated water vapor (IWV) as measured by HAMSTRAD were compared with measurements from radiosondes launched in three different sites: Lannemezan (43?07'N, 0?23'E, 610 m asml), France (~30 km northeast from PdM), Bordeaux-Me?rignac Airport (44?49'N, 0?42'W, 50 m asml), France ( ~ 220 km northwest from PdM), and Zaragoza (41?39'N, 0?53'W, 263 m asml), Spain ( ~170 km southwest from PdM). The validation process also used the vertical profiles of tropospheric H2O as measured by the nadir-viewing infrared atmospheric sounding interferometer (IASI) instrument aboard the MetOp-A space platform. The temporal evolution of the HAMSTRAD H2O measurements above the PdM station is very consistent with IASI, sonde, and in situ measurements, tracking the same atmosphere from a dry period in February to a wet period in June. HAMSTRAD showed unrealistic values in periods of well-established snow tempest. While the sensitivity of the HAMSTRAD measurements tends to be degraded 6 km above the altitude of the instrument, namely, above 8877 m asml, the HAMSTRAD measurements seem reasonable at the uppermost retrieval level (namely, 10 km, 12 877 m asml). In May, the wet periods are systematically showing a good agreement between sonde and HAMSTRAD IWV fields and H2O below 6777 m asml but a dry bias of IASI by more than 4-kg m-2 IWV, where- – as outside of these periods, the three data sets behave consistently. Since the best results (mean, standard deviation, bias, and correlation) are obtained when the HAMSTRAD radiometer operates in the very dry conditions of February, namely, in dryness conditions comparable to Dome C summertime values, we are very confident in the optimal use of the instrument when deployed in Antarctica. |
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910 |
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0196-2892 |
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52 |
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The 183-GHz radiometer HAMSTRAD: Validation over the Pyrenees mountains (France) and first measurements at Dome C (Antarctica) |
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Conference - International - Article without Reading Comitee |
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2010 |
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910 |
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Bachelor's thesis |
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223 |
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