Estimation of the characteristic energy of electron precipitation
International audience Data from simultaneous observations (on 13 February 1996, 9 November 1998, and 12 February 1999) with the IRIS, DASI and EISCAT systems are employed in the study of the energy distribution of the electron precipitation during substorm activity. The estimation of the characteri...
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ftinsu:oai:HAL:hal-00317128v1 2023-11-12T04:16:36+01:00 Estimation of the characteristic energy of electron precipitation del Pozo, C. F. Kosch, M. J. Honary, F. Department Communication Systems 2002 https://hal.science/hal-00317128 https://hal.science/hal-00317128/document https://hal.science/hal-00317128/file/angeo-20-1349-2002.pdf en eng HAL CCSD European Geosciences Union hal-00317128 https://hal.science/hal-00317128 https://hal.science/hal-00317128/document https://hal.science/hal-00317128/file/angeo-20-1349-2002.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317128 Annales Geophysicae, 2002, 20 (9), pp.1349-1359 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2002 ftinsu 2023-10-25T16:25:22Z International audience Data from simultaneous observations (on 13 February 1996, 9 November 1998, and 12 February 1999) with the IRIS, DASI and EISCAT systems are employed in the study of the energy distribution of the electron precipitation during substorm activity. The estimation of the characteristic energy of the electron precipitation over the common field of view of IRIS and DASI is discussed. In particular, we look closely at the physical basis of the correspondence between the characteristic energy, the flux-averaged energy, as defined below, and the logarithm of the ratio of the green-light intensity to the square of absorption. This study expands and corrects results presented in the paper by Kosch et al. (2001). It is noticed, moreover, that acceleration associated with diffusion processes in the magnetosphere long before precipitation may be controlling the shape of the energy spectrum. We propose and test a "mixed" distribution for the energy-flux spectrum, exponential at the lower energies and Maxwellian or modified power-law at the higher energies, with a threshold energy separating these two regimes. The energy-flux spectrum at Tromsø, in the 1?320 keV range, is derived from EISCAT electron density profiles in the 70?140 km altitude range and is applied in the "calibration" of the optical intensity and absorption distributions, in order to extrapolate the flux and characteristic energy maps. Article in Journal/Newspaper EISCAT Tromsø Institut national des sciences de l'Univers: HAL-INSU Tromsø |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences del Pozo, C. F. Kosch, M. J. Honary, F. Estimation of the characteristic energy of electron precipitation |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Data from simultaneous observations (on 13 February 1996, 9 November 1998, and 12 February 1999) with the IRIS, DASI and EISCAT systems are employed in the study of the energy distribution of the electron precipitation during substorm activity. The estimation of the characteristic energy of the electron precipitation over the common field of view of IRIS and DASI is discussed. In particular, we look closely at the physical basis of the correspondence between the characteristic energy, the flux-averaged energy, as defined below, and the logarithm of the ratio of the green-light intensity to the square of absorption. This study expands and corrects results presented in the paper by Kosch et al. (2001). It is noticed, moreover, that acceleration associated with diffusion processes in the magnetosphere long before precipitation may be controlling the shape of the energy spectrum. We propose and test a "mixed" distribution for the energy-flux spectrum, exponential at the lower energies and Maxwellian or modified power-law at the higher energies, with a threshold energy separating these two regimes. The energy-flux spectrum at Tromsø, in the 1?320 keV range, is derived from EISCAT electron density profiles in the 70?140 km altitude range and is applied in the "calibration" of the optical intensity and absorption distributions, in order to extrapolate the flux and characteristic energy maps. |
author2 |
Department Communication Systems |
format |
Article in Journal/Newspaper |
author |
del Pozo, C. F. Kosch, M. J. Honary, F. |
author_facet |
del Pozo, C. F. Kosch, M. J. Honary, F. |
author_sort |
del Pozo, C. F. |
title |
Estimation of the characteristic energy of electron precipitation |
title_short |
Estimation of the characteristic energy of electron precipitation |
title_full |
Estimation of the characteristic energy of electron precipitation |
title_fullStr |
Estimation of the characteristic energy of electron precipitation |
title_full_unstemmed |
Estimation of the characteristic energy of electron precipitation |
title_sort |
estimation of the characteristic energy of electron precipitation |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00317128 https://hal.science/hal-00317128/document https://hal.science/hal-00317128/file/angeo-20-1349-2002.pdf |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317128 Annales Geophysicae, 2002, 20 (9), pp.1349-1359 |
op_relation |
hal-00317128 https://hal.science/hal-00317128 https://hal.science/hal-00317128/document https://hal.science/hal-00317128/file/angeo-20-1349-2002.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333661843030016 |