Waves in the plasma depletion layer derived from three magnetosheath passes made by wind

We analyze theoretically wave activity in the plasma depletion layer (PDL) based on measurements made by the WIND spacecraft on 3 passes of the magnetosheath at low, southern magnetic latitudes and within 1 hour of noon. The passes occurred on November 30, December 12, and December 24, 1994. They we...

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Detalles Bibliográficos
Autores principales: Gnavi, Graciela Delia, Gratton, Fausto Tulio Livio
Publicado: 2003
Materias:
Anisotropy
Electromagnetism
Magnetosphere
Spacecraft
Thermal anisotropy
Space research
magnetosphere
plasma
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v31_n4_p1099_Farrugia
http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1099_Farrugia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02731177_v31_n4_p1099_Farrugia
record_format dspace
spelling paper:paper_02731177_v31_n4_p1099_Farrugia2023-06-08T15:25:31Z Waves in the plasma depletion layer derived from three magnetosheath passes made by wind Gnavi, Graciela Delia Gratton, Fausto Tulio Livio Anisotropy Electromagnetism Magnetosphere Spacecraft Thermal anisotropy Space research magnetosphere plasma We analyze theoretically wave activity in the plasma depletion layer (PDL) based on measurements made by the WIND spacecraft on 3 passes of the magnetosheath at low, southern magnetic latitudes and within 1 hour of noon. The passes occurred on November 30, December 12, and December 24, 1994. They were under moderate-to-low solar wind dynamic pressure, allowing a characterization of the near-subsolar PDL under typical solar wind conditions. Magnetic fluctuations transverse to the background field characteristic of electromagnetic ion cyclotron waves are present in all 3 PDLs and we illustrate this by the December 24, 1994 pass. We estimate numerically the electromagnetic ion cyclotron wave excitation, using measured parameters and supplementing these by average values for those other parameters which were not available. The activity increases as the magnetopause is approached, except for November 30. The interplay of the proton thermal anisotropy and the proton beta parallel to the magnetic field, quantities which are anticorrelated, may be used to explain the major similarities and differences of the theoretical results for the respective passes. These are the only 3 passes near the subsolar region for moderate-to-low dynamic pressure which have been examined to date, and the only ones made in this locale by Wind. © 2003 COSPAR. Published by Elservier Science Ltd. All rights reserved. Fil:Gnavi, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gratton, F.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v31_n4_p1099_Farrugia http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1099_Farrugia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anisotropy
Electromagnetism
Magnetosphere
Spacecraft
Thermal anisotropy
Space research
magnetosphere
plasma
spellingShingle Anisotropy
Electromagnetism
Magnetosphere
Spacecraft
Thermal anisotropy
Space research
magnetosphere
plasma
Gnavi, Graciela Delia
Gratton, Fausto Tulio Livio
Waves in the plasma depletion layer derived from three magnetosheath passes made by wind
topic_facet Anisotropy
Electromagnetism
Magnetosphere
Spacecraft
Thermal anisotropy
Space research
magnetosphere
plasma
description We analyze theoretically wave activity in the plasma depletion layer (PDL) based on measurements made by the WIND spacecraft on 3 passes of the magnetosheath at low, southern magnetic latitudes and within 1 hour of noon. The passes occurred on November 30, December 12, and December 24, 1994. They were under moderate-to-low solar wind dynamic pressure, allowing a characterization of the near-subsolar PDL under typical solar wind conditions. Magnetic fluctuations transverse to the background field characteristic of electromagnetic ion cyclotron waves are present in all 3 PDLs and we illustrate this by the December 24, 1994 pass. We estimate numerically the electromagnetic ion cyclotron wave excitation, using measured parameters and supplementing these by average values for those other parameters which were not available. The activity increases as the magnetopause is approached, except for November 30. The interplay of the proton thermal anisotropy and the proton beta parallel to the magnetic field, quantities which are anticorrelated, may be used to explain the major similarities and differences of the theoretical results for the respective passes. These are the only 3 passes near the subsolar region for moderate-to-low dynamic pressure which have been examined to date, and the only ones made in this locale by Wind. © 2003 COSPAR. Published by Elservier Science Ltd. All rights reserved.
author Gnavi, Graciela Delia
Gratton, Fausto Tulio Livio
author_facet Gnavi, Graciela Delia
Gratton, Fausto Tulio Livio
author_sort Gnavi, Graciela Delia
title Waves in the plasma depletion layer derived from three magnetosheath passes made by wind
title_short Waves in the plasma depletion layer derived from three magnetosheath passes made by wind
title_full Waves in the plasma depletion layer derived from three magnetosheath passes made by wind
title_fullStr Waves in the plasma depletion layer derived from three magnetosheath passes made by wind
title_full_unstemmed Waves in the plasma depletion layer derived from three magnetosheath passes made by wind
title_sort waves in the plasma depletion layer derived from three magnetosheath passes made by wind
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v31_n4_p1099_Farrugia
http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1099_Farrugia
work_keys_str_mv AT gnavigracieladelia wavesintheplasmadepletionlayerderivedfromthreemagnetosheathpassesmadebywind
AT grattonfaustotuliolivio wavesintheplasmadepletionlayerderivedfromthreemagnetosheathpassesmadebywind
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