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: Farrugia, C.J., Gnavi, G., Gratton, F.T., Oieroset, M., Ogilvie, K.W., Lepping, R.P., Lin, R.P.
Formato: JOUR
Materias:
Anisotropy
Electromagnetism
Magnetosphere
Spacecraft
Thermal anisotropy
Space research
magnetosphere
plasma
Acceso en línea: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 todo:paper_02731177_v31_n4_p1099_Farrugia
record_format dspace
spelling todo:paper_02731177_v31_n4_p1099_Farrugia2023-10-03T15:15:31Z Waves in the plasma depletion layer derived from three magnetosheath passes made by wind Farrugia, C.J. Gnavi, G. Gratton, F.T. Oieroset, M. Ogilvie, K.W. Lepping, R.P. Lin, R.P. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
Farrugia, C.J.
Gnavi, G.
Gratton, F.T.
Oieroset, M.
Ogilvie, K.W.
Lepping, R.P.
Lin, R.P.
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.
format JOUR
author Farrugia, C.J.
Gnavi, G.
Gratton, F.T.
Oieroset, M.
Ogilvie, K.W.
Lepping, R.P.
Lin, R.P.
author_facet Farrugia, C.J.
Gnavi, G.
Gratton, F.T.
Oieroset, M.
Ogilvie, K.W.
Lepping, R.P.
Lin, R.P.
author_sort Farrugia, C.J.
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
url http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1099_Farrugia
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