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| Titel |
Pressure enhancement associated with meridional flow in high-speed solar wind: possible evidence for an interplanetary magnetic flux rope |
| VerfasserIn |
C.-Y. Tu, E. Marsch, K. Ivory, R. Schwenn |
| 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 ; 15, no. 2 ; Nr. 15, no. 2, S.137-142 |
| Datensatznummer |
250012622
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| Publikation (Nr.) |
 copernicus.org/angeo-15-137-1997.pdf |
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| Zusammenfassung |
| A sizable total-pressure (magnetic pressure
plus kinetic pressure) enhancement was found within the high-speed wind stream
observed by Helios 2 in 1976 near 0.3 AU. The proton density and temperature and
the magnetic magnitude simultaneously increased for about 6 h. This pressure
rise was associated with a comparatively large southward flow velocity component
(with Vz ≈ –100 km · s–1)
and magnetic-field rotation. The pressure enhancement was associated with
unusual features in the electron distribution function. It shows a wide angular
distribution of electron counting rates in the low-energy (57.8 eV) channel,
while previous to the enhancement it exhibits a wide angular distribution of
electron count rate in the high-energy (112, 221 and 309 eV) channels, perhaps
indicating the mirroring of electrons in the converging field lines of the
background magnetic field. These fluid and kinetic phenomena may be explained as
resulting from an interplanetary magnetic flux rope which is not fully convected
by the flow but moves against the background wind towards the Sun. |
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