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| Titel |
Observations of omega bands using an imaging riometer |
| VerfasserIn |
A. J. Kavanagh, J. A. Wild, F. Honary |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-06), S.4183-4195 |
| Datensatznummer |
250016702
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4183-2009.pdf |
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| Zusammenfassung |
| We present a case study of an omega band current system from 11 May 1998
using data from the Imaging Riometer for Ionospheric Studies (IRIS) in
Finland. For the first time, images of a substorm-related omega band in
cosmic noise absorption are shown. The substorm in question was one of a
string that occurred on that day; inspection of geostationary satellite data
indicates that this was a sawtooth event. Using a previously established
statistical relationship, the IRIS data is used to provide maps of Hall
conductance and compared with previous estimates utilising both HF and VHF
coherent-scatter radars. Discrepancies are discussed with reference to
precipitation spectrum and the geometry of the experimental set-up. The
imaging riometer data provides a higher spatial resolution than the combined
magnetometer-radar pairing for determining the Hall conductance and can also
be used to identify the extent of the precipitation in the absence of
optical data. |
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