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| Titel |
Three-dimensional MHD simulation of interplanetary magnetic field changes at 1 AU as a consequence of simulated solar flares |
| VerfasserIn |
C.-C. Wu, M. Dryer, S. T. Wu |
| 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. 4 ; Nr. 14, no. 4, S.383-399 |
| Datensatznummer |
250012255
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| Publikation (Nr.) |
 copernicus.org/angeo-14-383-1996.pdf |
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| Zusammenfassung |
| A fully three-dimensional (3D),
time-dependent, MHD interplanetary global model (3D IGM) has been used, for the
first time, to study the relationship between different forms of solar activity
and transient variations of the north-south component, Bz, of
the interplanetary magnetic field (IMF) at 1 AU. One form of solar activity, the
flare, is simulated by using a pressure pulse at different locations near the
solar surface and observing the simulated IMF evolution of Bθ
(=–Bz) at 1 AU. Results show that, for a given pressure pulse,
the orientation of the corresponding transient variation of Bz
has a strong relationship to the location of the pressure pulse and the initial
conditions of the IMF. Two initial IMF conditions are considered: a unipolar
Archimedean spiral with outward polarity and a flat heliospheric current sheet (HCS)
with outward polarity in the northern hemisphere and which gradually reverses
polarity in the solar equatorial plane to inward polarity in the southern
heliospheric hemisphere. The wave guide effect of the HCS is also demonstrated. |
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