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| Titel |
A simple oblique dip model for geomagnetic micropulsations |
| VerfasserIn |
J. A. Lawrie, P. N. Smith |
| 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 ; 17, no. 2 ; Nr. 17, no. 2, S.304-306 |
| Datensatznummer |
250013681
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| Publikation (Nr.) |
 copernicus.org/angeo-17-304-1999.pdf |
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| Zusammenfassung |
It is pointed out that simple models adopted
so far have tended to neglect the obliquity of the magnetic field lines entering
the Earth's surface. A simple alternative model is presented, in which the
ambient field lines are straight, but enter wedge shaped boundaries at half a
right-angle. The model is illustrated by assuming an axially symmetric,
compressional, impulse type disturbance at the outer boundary, all other
boundaries being assumed to be perfectly conducting. The numerical method used
is checked from the instant the excitation ceases, by an analytical method. The
first harmonic along field lines is found to be of noticeable size, but appears
to be mainly due to coupling with the fundamental, and with the first harmonic
across field lines.
Key words. Magnetospheric physics (MHD waves and
instabilities). |
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