Monitoring cusp/cleft topology using Pc5 ULF waves
Induction magnetometer data recorded at three closely spaced sites (~120 Km) in Antarctica (mlat ~−75°) have been examined for ionospheric signatures of the cusp/cleft region of the magnetosphere. Crossphase analysis of the 1-10 mHz band, using pure-state filtering techniques reveal diurnally varyin...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
1998
|
Subjects: | |
Online Access: | http://hdl.handle.net/1959.13/31780 |
id |
ftunivnewcastnsw:uon:2808 |
---|---|
record_format |
openpolar |
spelling |
ftunivnewcastnsw:uon:2808 2023-05-15T13:54:24+02:00 Monitoring cusp/cleft topology using Pc5 ULF waves Ables, S. T. Fraser, B. J. Waters, C. L. Neudegg, D. A. Morris, R. J. 1998 http://hdl.handle.net/1959.13/31780 eng eng American Geophysical Union Geophysical Research Letters Vol. 25, Issue 9, p. 1507-1510 10.1029/98GL00848 magnetosphere cusp/cleft region ionosphere geomagnetic activity ULF waves journal article 1998 ftunivnewcastnsw 2018-07-27T00:15:34Z Induction magnetometer data recorded at three closely spaced sites (~120 Km) in Antarctica (mlat ~−75°) have been examined for ionospheric signatures of the cusp/cleft region of the magnetosphere. Crossphase analysis of the 1-10 mHz band, using pure-state filtering techniques reveal diurnally varying field line resonances embedded in the spectra, while interstation phase lag measurements indicate azimuthal propagation of waves away from local magnetic noon. Using the T89 external field model crossphase measurements are put in the context of diurnally changing field line topology due to compression at the subsolar region and stretching along the dawn and dusk flanks. On six of the eight days of this study we have identify a consistent two dimensional phase pattern projected in the dayside ionosphere, indicating closed field lines thread these sites during periods of low to moderate geomagnetic activity (Kp<3). Article in Journal/Newspaper Antarc* Antarctica NOVA: The University of Newcastle Research Online (Australia) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
magnetosphere cusp/cleft region ionosphere geomagnetic activity ULF waves |
spellingShingle |
magnetosphere cusp/cleft region ionosphere geomagnetic activity ULF waves Ables, S. T. Fraser, B. J. Waters, C. L. Neudegg, D. A. Morris, R. J. Monitoring cusp/cleft topology using Pc5 ULF waves |
topic_facet |
magnetosphere cusp/cleft region ionosphere geomagnetic activity ULF waves |
description |
Induction magnetometer data recorded at three closely spaced sites (~120 Km) in Antarctica (mlat ~−75°) have been examined for ionospheric signatures of the cusp/cleft region of the magnetosphere. Crossphase analysis of the 1-10 mHz band, using pure-state filtering techniques reveal diurnally varying field line resonances embedded in the spectra, while interstation phase lag measurements indicate azimuthal propagation of waves away from local magnetic noon. Using the T89 external field model crossphase measurements are put in the context of diurnally changing field line topology due to compression at the subsolar region and stretching along the dawn and dusk flanks. On six of the eight days of this study we have identify a consistent two dimensional phase pattern projected in the dayside ionosphere, indicating closed field lines thread these sites during periods of low to moderate geomagnetic activity (Kp<3). |
format |
Article in Journal/Newspaper |
author |
Ables, S. T. Fraser, B. J. Waters, C. L. Neudegg, D. A. Morris, R. J. |
author_facet |
Ables, S. T. Fraser, B. J. Waters, C. L. Neudegg, D. A. Morris, R. J. |
author_sort |
Ables, S. T. |
title |
Monitoring cusp/cleft topology using Pc5 ULF waves |
title_short |
Monitoring cusp/cleft topology using Pc5 ULF waves |
title_full |
Monitoring cusp/cleft topology using Pc5 ULF waves |
title_fullStr |
Monitoring cusp/cleft topology using Pc5 ULF waves |
title_full_unstemmed |
Monitoring cusp/cleft topology using Pc5 ULF waves |
title_sort |
monitoring cusp/cleft topology using pc5 ulf waves |
publisher |
American Geophysical Union |
publishDate |
1998 |
url |
http://hdl.handle.net/1959.13/31780 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Geophysical Research Letters Vol. 25, Issue 9, p. 1507-1510 10.1029/98GL00848 |
_version_ |
1766260148696776704 |