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| Titel |
An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations |
| VerfasserIn |
K. Prikner, K. Mursula, J. Kangas, R. Kerttula, F. Z. Feygin |
| 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 ; 22, no. 2 ; Nr. 22, no. 2 (2004-01-01), S.643-651 |
| Datensatznummer |
250014788
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| Publikation (Nr.) |
 copernicus.org/angeo-22-643-2004.pdf |
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| Zusammenfassung |
On 2 December 1999, the magnetometer stations in northern Finland registered
structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous
EISCAT radar measurements of the high-latitude ionosphere, we have studied the
ionospheric resonator properties during this multiband Pc1 event. The frequencies of the three
structured Pc1 bands were found to closely correspond to the second, third and fourth
harmonic of the calculated fundamental frequency of the ionospheric Alfvén resonator (IAR). In
addition, those frequencies of the three pearl bands that were closest to the exact IAR
harmonics were found to have the strongest intensities. The results demonstrate that the resonator
can have an important role on ground-based Pc1 activity over a notably large frequency
range, favoring transmission of waves with frequencies close to the resonator's
eigenfrequencies. Since the frequencies of all three bands correspond to the maximum rather than
the minimum of the transmission coefficient, the traditional bouncing wave packet model
needs to be revised.
Key words. Ionosphere (auroral ionosphere; ionosphere
magnetosphere interactions; wave propagation) |
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