Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/44996

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Title
Validation of southern hemisphere field-aligned currents calculated from iridium magnetic field data
Author/Creator
Green, David L.;  Waters, Colin L.;  Korth, Haje;  Anderson, Brian J.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences
Description
We present a validation study of southern hemisphere field-aligned current (FAC) distributions calculated from magnetic field perturbation data observed by the Iridium satellite constellation. In contrast to the northern hemisphere, the offset between the geomagnetic pole on which geomagnetic phenomena are centered, and the Iridium orbit plane intersection points becomes important for southern hemisphere studies. We investigate the reliability of FAC reconstruction for all possible offset locations using both spherical harmonic and elementary current system based algorithms. The results show that the accuracy of the reconstructed FAC distributions decreases with increasing offset. For small southern hemisphere offsets the FAC results are found to be accurate while for the medium to maximum offset range the accuracy depends on the FAC configuration. In general, a large offset has little effect for FAC distributions associated with a southward directed IMF and a maximum effect for northward IMF cases. The results also show the offset has no significant effect on northern hemisphere studies.
Relation
7th Australian Space Science Conference. Proceedings of the 7th Australian Space Science Conference (Sydney 24-27 September, 2007) p. 110-117
Relation
http://www.nssa.com.au/ocs/index.php?cf=8
Date
2008
Publisher
National Space Society of Australia
Keyword(s)
Birkeland currents;  field-aligned currents;  iridium;  ionospheric currents;  auroral zones;  current distribution;  geomagnetism
Resource Type
conference paper
Identifier
http://hdl.handle.net/1959.13/44996
Identifier
ISBN:9780977574018
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Subject
"Validation of southern hemisphere field-aligned currents calculated from iridium magnetic field data"
 
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