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| Titel |
Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements |
| VerfasserIn |
K. Prikner |
| 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 ; 14, no. 7 ; Nr. 14, no. 7, S.699-706 |
| Datensatznummer |
250012351
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| Publikation (Nr.) |
 copernicus.org/angeo-14-699-1996.pdf |
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| Zusammenfassung |
| Three series of simultaneous pulsation
measurements ( f<0.06 Hz) on the Freja satellite and at the Budkov
Observatory have been spectrally processed (FFT) in 6-min intervals of Freja's
transits near the local Budkov field line. Doppler-shifted, weighted
spectral-peak frequencies, determined in both transverse magnetic components in
the mean field-aligned coordinate system on Freja, allowed the estimation, by
comparison with the stable frequency at Budkov, of fundamental frequencies of
the local magnetic-field-line resonance ranged from 13 to 17 mHz in two
pulsation events analyzed, with Kp=2+ to 0+.
The ratio of total amplitudes of the spectral-pulsation components on the ground
and on Freja at an altitude of ~1700 km (values <0.7) characterizes the
transmissivity of the ionosphere. In the Pc3 frequency range this correlates
well with simulation computations using models of the ionosphere under low solar
activity. |
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