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| Titel |
The structure of low-latitude Pc3 pulsations observed by CHAMP and on the ground |
| VerfasserIn |
D. C. Ndiitwani, P. R. Sutcliffe |
| 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. 3 ; Nr. 27, no. 3 (2009-03-12), S.1267-1277 |
| Datensatznummer |
250016454
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1267-2009.pdf |
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| Zusammenfassung |
| The structure of low-latitude continuous pulsations termed Pc3, which are
naturally occurring MHD waves in the Earth's magnetosphere, were studied by
comparing ground and satellite magnetic field measurements. Data from two
induction magnetometers, located at Hermanus and Sutherland in South Africa
were used in conjunction with Challenging Minisatellite Payload (CHAMP)
satellite observations to study a Pc3 event observed on 15 February 2003, at
a time when CHAMP was passing over the ground stations. We observed a number
of discrete frequency oscillations for the fast mode wave, one of which
drives a field line resonance (FLR) at characteristic latitude as detected
by both ground and satellite measurements. Consequently, our observations
confirmed the compressional wave as being the driver of the field line
resonance. The toroidal mode frequency observed on CHAMP experienced a
Doppler frequency shift due to the rapid motion across the resonance region.
Polarization hodograms in the resonance region clearly showed the expected
90° rotation of the field line resonant magnetic field components. |
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