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| Titel |
Upstream waves and field line resonances: simultaneous presence and alternation in Pc3 pulsation events |
| VerfasserIn |
J. Verö, H. Lühr, M. Vellante, I. Best, J. Střeštik, J. C. Miletits, L. Holló, Judit Szendrõi, B. Zieger |
| 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. 1 ; Nr. 16, no. 1, S.34-48 |
| Datensatznummer |
250013100
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| Publikation (Nr.) |
 copernicus.org/angeo-16-34-1998.pdf |
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| Zusammenfassung |
Based on a detailed study of Pc3 events at an
array between L = 1.5 and 3 in Central Europe, the authors found quick
changes between upstream waves (UW, i.e. pulsation directly driven by UW) and
field line resonance (FLR, i.e. azimuthal oscillations of geomagnetic field
lines). The alternation of the two types is especially characteristic (and the
UW part stronger) if the interplanetary magnetic field (IMF) is highly variable.
Events due to field line resonance may have a structure consisting of multiple
lines with frequencies differing by about 10%, corresponding to neighbouring
shells of field lines separated by about 100 km at the surface. This coincides
with previous findings (about 10% at a meridional distance of 80 km). The
frequency of the UW type is well correlated with the frequency of waves in the
interplanetary medium. Additionally, there are signals of unidentified origin
which also seem to be influenced by IMF.
>Key words. Magnetosphere Physics · MHD waves and
instabilities · Plasmasphere · Solar wind/magnetosphere interactions |
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