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| Titel |
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
| VerfasserIn |
S. Lepidi, P. Francia, U. Villante, A. Meloni, A. J. Lazarus, R. P. Lepping |
| 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 ; 17, no. 10 ; Nr. 17, no. 10, S.1245-1250 |
| Datensatznummer |
250013818
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1245-1999.pdf |
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| Zusammenfassung |
An analysis of the low frequency geomagnetic
field fluctuations at an Antarctic (Terra Nova Bay) and a low latitude
(L'Aquila, Italy) station during the Earth's passage of a coronal ejecta on
April 11, 1997 shows that major solar wind pressure variations were followed at
both stations by a high fluctuation level. During northward interplanetary
magnetic field conditions and when Terra Nova Bay is close to the local
geomagnetic noon, coherent fluctuations, at the same frequency (3.6 mHz) and
with polarization characteristics indicating an antisunward propagation, were
observed simultaneously at the two stations. An analysis of simultaneous
measurements from geosynchronous satellites shows evidence for pulsations at
approximately the same frequencies also in the magnetospheric field. The
observed waves might then be interpreted as oscillation modes, triggered by an
external stimulation, extending to a major portion of the Earth's magnetosphere.
Key words. Magnetospheric physics (MHD waves and
instabilities; solar wind-magnetosphere interactions) |
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