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| Titel |
IMP 8 magnetosheath field comparisons with models |
| VerfasserIn |
Z. Kaymaz |
| 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.376-387 |
| Datensatznummer |
250013239
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| Publikation (Nr.) |
 copernicus.org/angeo-16-376-1998.pdf |
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| Zusammenfassung |
This study presents cross-sectional vector
maps of the magnetic field derived from IMP 8 magnetometer in the magnetosheath
at 30 Re behind the Earth. In addition the vector patterns of the
magnetosheath field for northward, southward, and east-west interplanetary
magnetic field (IMF) directions are qualitatively compared with those obtained
from the Spreiter-Stahara gas dynamic (GD) and Fedder-Lyon magnetohydrodynamic
models (MHD). The main purpose is to display the cross-sectional differences in
relation to the dayside merging with different IMF directions, allowing the
reader to make direct visual comparisons of the vector patterns. It is seen that
for east-west IMF directions, the data-based and MHD-based patterns differ
noticeably in a similar way from the GD model, presumably reflecting the
influence of dayside magnetic merging of the Earth's magnetic field with the
y-component of the interplanetary magnetic field. All three northward IMF cross
sections show comparable field draping patterns as expected for a closed
magnetosphere. For southward IMF case, on the other hand, differences between
the three cross-sectional patterns are greater as seen in the field vector sizes
and directions, especially closer to the magnetopause where more disturbed
magnetospheric conditions are known to be exist. The data comparisons with the
MHD and GD models show that the differences result from the magnetic field-flow
coupling and that the effects of dayside reconnection are present in IMP 8
magnetic field measurements.
Keywords. Vector maps · IMP 8 magnetometer ·
Inter-planetary magnetic fields |
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