Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments
International audience We present a detailed analysis of a long-lasting quasiperiodic (QP) event observed simultaneously by the low-altitude DEMETER spacecraft and on the ground by the instrumentation of the Sodankylä Geophysical Observatory, Finland. The event was observed on 26 February 2008. It l...
Published in: | Journal of Geophysical Research: Space Physics |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211/document https://hal-insu.archives-ouvertes.fr/insu-01393211/file/N-mec_et_al-2016-Journal_of_Geophysical_Research__Space_Physics-1.pdf https://doi.org/10.1002/2016JA022968 |
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[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] |
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[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] Němec, F. Bezděková, B. Manninen, J. Parrot, Michel Santolík, O. Hayosh, M. Turunen, T. Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] |
description |
International audience We present a detailed analysis of a long-lasting quasiperiodic (QP) event observed simultaneously by the low-altitude DEMETER spacecraft and on the ground by the instrumentation of the Sodankylä Geophysical Observatory, Finland. The event was observed on 26 February 2008. It lasted for several hours, and it was detected both in the Northern and Southern Hemispheres. The time intervals when the event was observed on board the satellite and/or on the ground provide us with an estimate of the event dimensions. When the event is detected simultaneously by the satellite and on the ground, the observed frequency-time structure is generally the same. However, the ratio of detected intensities varies significantly as a function of the spacecraft latitude, indicating the wave guiding along the plasmapause. Moreover, there is a delay as large as about 13 s between the times when individual QP elements are detected by the spacecraft and on the ground. This appears to be related to the azimuthal separation of the instruments, and it is highly relevant to the identification of a possible source mechanism. We suggest that it is due to an azimuthally propagating ULF wave which periodically modulates the azimuthally extended source region. Finally, we find that at the times when the intensity of the QP event suddenly increases, there is a distinct increase of the amplitude of Alfvénic ULF pulsations measured on the ground at high latitudes. This might indicate that the source region is located at L shells larger than about 7.1. |
author2 |
Faculty of Mathematics and Physics Praha/Prague Charles University Prague (CU) Sodankylä Geophysical Observatory University of Oulu Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Institute of Atmospheric Physics Prague (IAP) Czech Academy of Sciences Prague (CAS) |
format |
Article in Journal/Newspaper |
author |
Němec, F. Bezděková, B. Manninen, J. Parrot, Michel Santolík, O. Hayosh, M. Turunen, T. |
author_facet |
Němec, F. Bezděková, B. Manninen, J. Parrot, Michel Santolík, O. Hayosh, M. Turunen, T. |
author_sort |
Němec, F. |
title |
Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments |
title_short |
Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments |
title_full |
Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments |
title_fullStr |
Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments |
title_full_unstemmed |
Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments |
title_sort |
conjugate observations of a remarkable quasiperiodic event by the low-altitude demeter spacecraft and ground-based instruments |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211/document https://hal-insu.archives-ouvertes.fr/insu-01393211/file/N-mec_et_al-2016-Journal_of_Geophysical_Research__Space_Physics-1.pdf https://doi.org/10.1002/2016JA022968 |
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ENVELOPE(26.600,26.600,67.417,67.417) |
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Sodankylä |
geographic_facet |
Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_source |
ISSN: 2169-9380 EISSN: 2169-9402 Journal of Geophysical Research Space Physics https://hal-insu.archives-ouvertes.fr/insu-01393211 Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2016, 121 (9), pp.8790 - 8803. ⟨10.1002/2016JA022968⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JA022968 insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211/document https://hal-insu.archives-ouvertes.fr/insu-01393211/file/N-mec_et_al-2016-Journal_of_Geophysical_Research__Space_Physics-1.pdf doi:10.1002/2016JA022968 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016JA022968 |
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Journal of Geophysical Research: Space Physics |
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121 |
container_issue |
9 |
container_start_page |
8790 |
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8803 |
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spelling |
ftccsdartic:oai:HAL:insu-01393211v1 2023-05-15T18:20:18+02:00 Conjugate observations of a remarkable quasiperiodic event by the low-altitude DEMETER spacecraft and ground-based instruments Němec, F. Bezděková, B. Manninen, J. Parrot, Michel Santolík, O. Hayosh, M. Turunen, T. Faculty of Mathematics and Physics Praha/Prague Charles University Prague (CU) Sodankylä Geophysical Observatory University of Oulu Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Institute of Atmospheric Physics Prague (IAP) Czech Academy of Sciences Prague (CAS) 2016 https://hal-insu.archives-ouvertes.fr/insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211/document https://hal-insu.archives-ouvertes.fr/insu-01393211/file/N-mec_et_al-2016-Journal_of_Geophysical_Research__Space_Physics-1.pdf https://doi.org/10.1002/2016JA022968 en eng HAL CCSD American Geophysical Union/Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JA022968 insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211 https://hal-insu.archives-ouvertes.fr/insu-01393211/document https://hal-insu.archives-ouvertes.fr/insu-01393211/file/N-mec_et_al-2016-Journal_of_Geophysical_Research__Space_Physics-1.pdf doi:10.1002/2016JA022968 info:eu-repo/semantics/OpenAccess ISSN: 2169-9380 EISSN: 2169-9402 Journal of Geophysical Research Space Physics https://hal-insu.archives-ouvertes.fr/insu-01393211 Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2016, 121 (9), pp.8790 - 8803. ⟨10.1002/2016JA022968⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1002/2016JA022968 2021-11-21T02:40:47Z International audience We present a detailed analysis of a long-lasting quasiperiodic (QP) event observed simultaneously by the low-altitude DEMETER spacecraft and on the ground by the instrumentation of the Sodankylä Geophysical Observatory, Finland. The event was observed on 26 February 2008. It lasted for several hours, and it was detected both in the Northern and Southern Hemispheres. The time intervals when the event was observed on board the satellite and/or on the ground provide us with an estimate of the event dimensions. When the event is detected simultaneously by the satellite and on the ground, the observed frequency-time structure is generally the same. However, the ratio of detected intensities varies significantly as a function of the spacecraft latitude, indicating the wave guiding along the plasmapause. Moreover, there is a delay as large as about 13 s between the times when individual QP elements are detected by the spacecraft and on the ground. This appears to be related to the azimuthal separation of the instruments, and it is highly relevant to the identification of a possible source mechanism. We suggest that it is due to an azimuthally propagating ULF wave which periodically modulates the azimuthally extended source region. Finally, we find that at the times when the intensity of the QP event suddenly increases, there is a distinct increase of the amplitude of Alfvénic ULF pulsations measured on the ground at high latitudes. This might indicate that the source region is located at L shells larger than about 7.1. Article in Journal/Newspaper Sodankylä Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Journal of Geophysical Research: Space Physics 121 9 8790 8803 |