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| Titel |
Long-period geomagnetic pulsations caused by the solar wind negative pressure impulse on 22 March 1979 (CDAW-6) |
| VerfasserIn |
V. A. Parkhomov, V. V. Mishin, L. V. Borovik |
| 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 ; 16, no. 2 ; Nr. 16, no. 2, S.134-139 |
| Datensatznummer |
250013149
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| Publikation (Nr.) |
 copernicus.org/angeo-16-134-1998.pdf |
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| Zusammenfassung |
An analysis is made of the long-period
geomagnetic pulsations as recorded at seven Norilsk meridian stations
(λ=162°, latitudinal range: 61°–71°N) following abrupt
magnetospheric expansion during the storm of 22 March 1979 caused by a rapid
decrease in solar wind density. As with the time interval following an abrupt
contraction at the time of sudden storm commencement, there exist two types of
pulsations in the pulsation spectra: latitude-independent
(T>400 s) and latitude-dependent (T<200 s) pulsations. The
first pulsation type is interpreted in terms of forced pulsations associated
with magnetopause oscillations. The oscillation period is determined by plasma
density in the boundary layer and by the radius of the magnetosphere (T ~ ρ1/2R4).
The latitudinal dependence of the period, amplitude and polarization of the
second-type pulsations is in agreement with the resonance mechanism of their
origin.
Keywords. Geomagnetic pulsations · Solar wind ·
Magnetopause oscillations |
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