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| Titel |
Generation and evolution of interplanetary slow shocks |
| VerfasserIn |
C.-C. Wu, S. T. Wu, M. Dryer |
| 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.375-382 |
| Datensatznummer |
250012254
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| Publikation (Nr.) |
 copernicus.org/angeo-14-375-1996.pdf |
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| Zusammenfassung |
| It is well known that most MHD shocks
observed within 1 AU are MHD fast shocks. Only a very limited number of MHD slow
shocks are observed within 1 AU. In order to understand why there are only a few
MHD slow shocks observed within 1 AU, we use a one-dimensional, time-dependent
MHD code with an adaptive grid to study the generation and evolution of
interplanetary slow shocks (ISS) in the solar wind. Results show that a
negative, nearly square-wave perturbation will generate a pair of slow shocks (a
forward and a reverse slow shock). In addition, the forward and the reverse slow
shocks can pass through each other without destroying their characteristics, but
the propagating speeds for both shocks are decreased. A positive, square-wave
perturbation will generate both slow and fast shocks. When a forward slow shock
(FSS) propagates behind a forward fast shock (FFS), the former experiences a
decreasing Mach number. In addition, the FSS always disappears within a distance
of 150R⊙ (where R⊙ is one
solar radius) from the Sun when there is a forward fast shock (with Mach number
≥1.7) propagating in front of the FSS. In all tests that we have performed,
we have not discovered that the FSS (or reverse slow shock) evolves into a FFS
(or reverse fast shock). Thus, we do not confirm the FSS-FFS evolution as
suggested by Whang (1987). |
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