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| Titel |
In situ local shock speed and transit shock speed |
| VerfasserIn |
S. Watari, T. Detman |
| 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. 4 ; Nr. 16, no. 4, S.370-375 |
| Datensatznummer |
250013238
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| Publikation (Nr.) |
 copernicus.org/angeo-16-370-1998.pdf |
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| Zusammenfassung |
A useful index for estimating the transit
speeds was derived by analyzing interplanetary shock observations. This index is
the ratio of the in situ local shock speed and the transit speed; it is 0.6–0.9
for most observed shocks. The local shock speed and the transit speed calculated
for the results of the magnetohydrodynamic simulation show good agreement with
the observations. The relation expressed by the index is well explained by a
simplified propagation model assuming a blast wave. For several shocks the ratio
is approximately 1.2, implying that these shocks accelerated during propagation
in slow-speed solar wind. This ratio is similar to that for the background solar
wind acceleration.
Keywords. Interplanetary physics (Flare and stream
dynamics; Interplanetary shocks; Solar wind plasma) |
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