Energetic electron precipitation and auroral morphology at the substorm recovery phase
Abstract It is well known that auroral patterns at the substorm recovery phase are characterized by diffuse or patch structures with intensity pulsation. According to satellite measurements and simulation studies, the precipitating electrons associated with these aurorae can reach or exceed energies...
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ftunivoulu:oai:oulu.fi:nbnfi-fe2019092429566 2023-07-30T03:58:37+02:00 Energetic electron precipitation and auroral morphology at the substorm recovery phase Oyama, S. (S.) Kero, A. (A.) Rodger, C. J. (C. J.) Clilverd, M. A. (M. A.) Miyoshi, Y. (Y.) Partamies, N. (N.) Turunen, E. (E.) Raita, T. (T.) Verronen, P. T. (P. T.) Saito, S. (S.) 2017 application/pdf http://urn.fi/urn:nbn:fi-fe2019092429566 eng eng American Geophysical Union info:eu-repo/grantAgreement/EC/FP7/263218/EU/A new, ground based data-assimilative modeling of the Earth’s plasmasphere - a critical contribution to Radiation Belt modeling for Space Weather purposes/PLASMON info:eu-repo/semantics/openAccess © 2017. American Geophysical Union. All Rights Reserved. EEP auroral patch ionosphere plasma wave recovery phase substorm info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftunivoulu 2023-07-08T20:00:37Z Abstract It is well known that auroral patterns at the substorm recovery phase are characterized by diffuse or patch structures with intensity pulsation. According to satellite measurements and simulation studies, the precipitating electrons associated with these aurorae can reach or exceed energies of a few hundreds of keV through resonant wave‐particle interactions in the magnetosphere. However, because of difficulty of simultaneous measurements, the dependency of energetic electron precipitation (EEP) on auroral morphological changes in the mesoscale has not been investigated to date. In order to study this dependency, we have analyzed data from the European Incoherent Scatter (EISCAT) radar, the Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA) riometer, collocated cameras, ground‐based magnetometers, the Van Allen Probe satellites, Polar Operational Environmental Satellites (POES), and the Antarctic‐Arctic Radiation‐belt (Dynamic) Deposition‐VLF Atmospheric Research Konsortium (AARDDVARK). Here we undertake a detailed examination of two case studies. The selected two events suggest that the highest energy of EEP on those days occurred with auroral patch formation from postmidnight to dawn, coinciding with the substorm onset at local midnight. Measurements of the EISCAT radar showed ionization as low as 65 km altitude, corresponding to EEP with energies of about 500 keV. Article in Journal/Newspaper Antarc* Antarctic Arctic EISCAT Kilpisjärvi Jultika - University of Oulu repository Antarctic Arctic Kilpisjärvi ENVELOPE(20.767,20.767,69.034,69.034) The Antarctic |
institution |
Open Polar |
collection |
Jultika - University of Oulu repository |
op_collection_id |
ftunivoulu |
language |
English |
topic |
EEP auroral patch ionosphere plasma wave recovery phase substorm |
spellingShingle |
EEP auroral patch ionosphere plasma wave recovery phase substorm Oyama, S. (S.) Kero, A. (A.) Rodger, C. J. (C. J.) Clilverd, M. A. (M. A.) Miyoshi, Y. (Y.) Partamies, N. (N.) Turunen, E. (E.) Raita, T. (T.) Verronen, P. T. (P. T.) Saito, S. (S.) Energetic electron precipitation and auroral morphology at the substorm recovery phase |
topic_facet |
EEP auroral patch ionosphere plasma wave recovery phase substorm |
description |
Abstract It is well known that auroral patterns at the substorm recovery phase are characterized by diffuse or patch structures with intensity pulsation. According to satellite measurements and simulation studies, the precipitating electrons associated with these aurorae can reach or exceed energies of a few hundreds of keV through resonant wave‐particle interactions in the magnetosphere. However, because of difficulty of simultaneous measurements, the dependency of energetic electron precipitation (EEP) on auroral morphological changes in the mesoscale has not been investigated to date. In order to study this dependency, we have analyzed data from the European Incoherent Scatter (EISCAT) radar, the Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA) riometer, collocated cameras, ground‐based magnetometers, the Van Allen Probe satellites, Polar Operational Environmental Satellites (POES), and the Antarctic‐Arctic Radiation‐belt (Dynamic) Deposition‐VLF Atmospheric Research Konsortium (AARDDVARK). Here we undertake a detailed examination of two case studies. The selected two events suggest that the highest energy of EEP on those days occurred with auroral patch formation from postmidnight to dawn, coinciding with the substorm onset at local midnight. Measurements of the EISCAT radar showed ionization as low as 65 km altitude, corresponding to EEP with energies of about 500 keV. |
format |
Article in Journal/Newspaper |
author |
Oyama, S. (S.) Kero, A. (A.) Rodger, C. J. (C. J.) Clilverd, M. A. (M. A.) Miyoshi, Y. (Y.) Partamies, N. (N.) Turunen, E. (E.) Raita, T. (T.) Verronen, P. T. (P. T.) Saito, S. (S.) |
author_facet |
Oyama, S. (S.) Kero, A. (A.) Rodger, C. J. (C. J.) Clilverd, M. A. (M. A.) Miyoshi, Y. (Y.) Partamies, N. (N.) Turunen, E. (E.) Raita, T. (T.) Verronen, P. T. (P. T.) Saito, S. (S.) |
author_sort |
Oyama, S. (S.) |
title |
Energetic electron precipitation and auroral morphology at the substorm recovery phase |
title_short |
Energetic electron precipitation and auroral morphology at the substorm recovery phase |
title_full |
Energetic electron precipitation and auroral morphology at the substorm recovery phase |
title_fullStr |
Energetic electron precipitation and auroral morphology at the substorm recovery phase |
title_full_unstemmed |
Energetic electron precipitation and auroral morphology at the substorm recovery phase |
title_sort |
energetic electron precipitation and auroral morphology at the substorm recovery phase |
publisher |
American Geophysical Union |
publishDate |
2017 |
url |
http://urn.fi/urn:nbn:fi-fe2019092429566 |
long_lat |
ENVELOPE(20.767,20.767,69.034,69.034) |
geographic |
Antarctic Arctic Kilpisjärvi The Antarctic |
geographic_facet |
Antarctic Arctic Kilpisjärvi The Antarctic |
genre |
Antarc* Antarctic Arctic EISCAT Kilpisjärvi |
genre_facet |
Antarc* Antarctic Arctic EISCAT Kilpisjärvi |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/263218/EU/A new, ground based data-assimilative modeling of the Earth’s plasmasphere - a critical contribution to Radiation Belt modeling for Space Weather purposes/PLASMON |
op_rights |
info:eu-repo/semantics/openAccess © 2017. American Geophysical Union. All Rights Reserved. |
_version_ |
1772821376333250560 |