Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide
Energy from the outer regions of the magnetosphere may be transferred to the polar ionosphere by plasma waves. A magnetometer array operated during the Antarctic winter observed Ultra-Low-Frequency (ULF) plasma waves in the Pc 1–2 (0.1–10.0 Hz) frequency range, propagating parallel to the surface of...
Published in: | Antarctic Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2002
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102002000627 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102002000627 |
id |
crcambridgeupr:10.1017/s0954102002000627 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0954102002000627 2024-09-15T17:43:21+00:00 Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide Neudegg, D.A. Fraser, B.J. Menk, F.W. Burns, G.B. Morris, R.J. Underwood, M.J. 2002 http://dx.doi.org/10.1017/s0954102002000627 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102002000627 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 14, issue 1, page 93-103 ISSN 0954-1020 1365-2079 journal-article 2002 crcambridgeupr https://doi.org/10.1017/s0954102002000627 2024-07-17T04:01:33Z Energy from the outer regions of the magnetosphere may be transferred to the polar ionosphere by plasma waves. A magnetometer array operated during the Antarctic winter observed Ultra-Low-Frequency (ULF) plasma waves in the Pc 1–2 (0.1–10.0 Hz) frequency range, propagating parallel to the surface of the Earth in a waveguide or duct centred at ∼300 km altitude in the ionosphere. These compressional fast mode plasma waves most likely originated in the outer magnetosphere as shear mode plasma waves guided along the geomagnetic field. The region of origin in the magnetosphere for the waves is not certain as several widely spaced volumes map along geomagnetic field lines to a relatively close ensemble in the polar ionosphere. This paper compares the direction of propagation for the waves with signatures of magnetospheric regions geomagnetically projecting onto the ionosphere. Regions such as the polar cusp, low latitude boundary layer and mantle were observed by DMSP spacecraft and a SuperDARN high-frequency radar. The most likely region in the polar ionosphere for the fast mode waves to have originated from is equatorwards of the polar cusp, suggesting the field guided waves originated just inside the magnetopause. A case is made for association of the observed Pc1-2 ULF waves with post-noon, field-aligned-current systems driven by reconnection of the solar Interplanetary Magnetic Field (IMF) and the geomagnetic field near the magnetopause. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Cambridge University Press Antarctic Science 14 1 93 103 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Energy from the outer regions of the magnetosphere may be transferred to the polar ionosphere by plasma waves. A magnetometer array operated during the Antarctic winter observed Ultra-Low-Frequency (ULF) plasma waves in the Pc 1–2 (0.1–10.0 Hz) frequency range, propagating parallel to the surface of the Earth in a waveguide or duct centred at ∼300 km altitude in the ionosphere. These compressional fast mode plasma waves most likely originated in the outer magnetosphere as shear mode plasma waves guided along the geomagnetic field. The region of origin in the magnetosphere for the waves is not certain as several widely spaced volumes map along geomagnetic field lines to a relatively close ensemble in the polar ionosphere. This paper compares the direction of propagation for the waves with signatures of magnetospheric regions geomagnetically projecting onto the ionosphere. Regions such as the polar cusp, low latitude boundary layer and mantle were observed by DMSP spacecraft and a SuperDARN high-frequency radar. The most likely region in the polar ionosphere for the fast mode waves to have originated from is equatorwards of the polar cusp, suggesting the field guided waves originated just inside the magnetopause. A case is made for association of the observed Pc1-2 ULF waves with post-noon, field-aligned-current systems driven by reconnection of the solar Interplanetary Magnetic Field (IMF) and the geomagnetic field near the magnetopause. |
format |
Article in Journal/Newspaper |
author |
Neudegg, D.A. Fraser, B.J. Menk, F.W. Burns, G.B. Morris, R.J. Underwood, M.J. |
spellingShingle |
Neudegg, D.A. Fraser, B.J. Menk, F.W. Burns, G.B. Morris, R.J. Underwood, M.J. Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide |
author_facet |
Neudegg, D.A. Fraser, B.J. Menk, F.W. Burns, G.B. Morris, R.J. Underwood, M.J. |
author_sort |
Neudegg, D.A. |
title |
Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide |
title_short |
Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide |
title_full |
Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide |
title_fullStr |
Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide |
title_full_unstemmed |
Magnetospheric sources of Pc1-2 ULF waves observed in the polar ionospheric waveguide |
title_sort |
magnetospheric sources of pc1-2 ulf waves observed in the polar ionospheric waveguide |
publisher |
Cambridge University Press (CUP) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1017/s0954102002000627 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102002000627 |
genre |
Antarc* Antarctic Antarctic Science |
genre_facet |
Antarc* Antarctic Antarctic Science |
op_source |
Antarctic Science volume 14, issue 1, page 93-103 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102002000627 |
container_title |
Antarctic Science |
container_volume |
14 |
container_issue |
1 |
container_start_page |
93 |
op_container_end_page |
103 |
_version_ |
1810490290653364224 |