Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions
International audience Using the data from satellite CRRES and three geostationary LANL spacecraft, the propagation of an electron cloud from midnight to the evening sector is investigated. An electron cloud was injected during a weak isolated substorm that developed on a quiet geomagnetic backgroun...
Main Authors: | , , , , , , |
---|---|
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2006
|
Subjects: | |
Online Access: | https://hal.science/hal-00318189 https://hal.science/hal-00318189/document https://hal.science/hal-00318189/file/angeo-24-2667-2006.pdf |
id |
ftinsu:oai:HAL:hal-00318189v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-00318189v1 2023-11-12T04:16:37+01:00 Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions Lubchich, A. A. Yahnin, A. G. Titova, E. E. Demekhov, A. G. Trakhtengerts, V. Yu. Manninen, J. Turunen, T. Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Institute of Applied Physics of RAS Geophysical Observatory 2006-10-20 https://hal.science/hal-00318189 https://hal.science/hal-00318189/document https://hal.science/hal-00318189/file/angeo-24-2667-2006.pdf en eng HAL CCSD European Geosciences Union hal-00318189 https://hal.science/hal-00318189 https://hal.science/hal-00318189/document https://hal.science/hal-00318189/file/angeo-24-2667-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318189 Annales Geophysicae, 2006, 24 (10), pp.2667-2684 [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 2006 ftinsu 2023-10-25T16:25:04Z International audience Using the data from satellite CRRES and three geostationary LANL spacecraft, the propagation of an electron cloud from midnight to the evening sector is investigated. An electron cloud was injected during a weak isolated substorm that developed on a quiet geomagnetic background. It is found that within the local time sector from 03:00 until at least 08:00 MLT, the propagation of electrons at perpendicular pitch-angles is well described by a simple model of drift in the dipole magnetic field. The flux levels in the field-aligned electrons increase simultaneously with the flux at perpendicular pitch angles, which is attributed to the pitch angle diffusion by the whistler mode. This pitch-angle diffusion leads to precipitation of electrons from a drifting cloud and an increase in the ionospheric electron density, simultaneously observed above Tromsø, Norway, by the EISCAT UHF radar in the morning sector (04:40?05:25 MLT). The precipitation develops as quasi-periodic pulses with a period of about 100 s. We discuss the models of pulsating precipitation due to the whistler cyclotron instability and show that our observations can be explained by such a model. Article in Journal/Newspaper EISCAT Tromsø Institut national des sciences de l'Univers: HAL-INSU Norway Tromsø |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 Lubchich, A. A. Yahnin, A. G. Titova, E. E. Demekhov, A. G. Trakhtengerts, V. Yu. Manninen, J. Turunen, T. Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Using the data from satellite CRRES and three geostationary LANL spacecraft, the propagation of an electron cloud from midnight to the evening sector is investigated. An electron cloud was injected during a weak isolated substorm that developed on a quiet geomagnetic background. It is found that within the local time sector from 03:00 until at least 08:00 MLT, the propagation of electrons at perpendicular pitch-angles is well described by a simple model of drift in the dipole magnetic field. The flux levels in the field-aligned electrons increase simultaneously with the flux at perpendicular pitch angles, which is attributed to the pitch angle diffusion by the whistler mode. This pitch-angle diffusion leads to precipitation of electrons from a drifting cloud and an increase in the ionospheric electron density, simultaneously observed above Tromsø, Norway, by the EISCAT UHF radar in the morning sector (04:40?05:25 MLT). The precipitation develops as quasi-periodic pulses with a period of about 100 s. We discuss the models of pulsating precipitation due to the whistler cyclotron instability and show that our observations can be explained by such a model. |
author2 |
Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Institute of Applied Physics of RAS Geophysical Observatory |
format |
Article in Journal/Newspaper |
author |
Lubchich, A. A. Yahnin, A. G. Titova, E. E. Demekhov, A. G. Trakhtengerts, V. Yu. Manninen, J. Turunen, T. |
author_facet |
Lubchich, A. A. Yahnin, A. G. Titova, E. E. Demekhov, A. G. Trakhtengerts, V. Yu. Manninen, J. Turunen, T. |
author_sort |
Lubchich, A. A. |
title |
Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions |
title_short |
Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions |
title_full |
Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions |
title_fullStr |
Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions |
title_full_unstemmed |
Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions |
title_sort |
longitudinal drift of substorm electrons as the reason of impulsive precipitation events and vlf emissions |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00318189 https://hal.science/hal-00318189/document https://hal.science/hal-00318189/file/angeo-24-2667-2006.pdf |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318189 Annales Geophysicae, 2006, 24 (10), pp.2667-2684 |
op_relation |
hal-00318189 https://hal.science/hal-00318189 https://hal.science/hal-00318189/document https://hal.science/hal-00318189/file/angeo-24-2667-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333696010878976 |