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| Titel |
Spatial and temporal variations of the high-altitude cusp precipitation |
| VerfasserIn |
Z. Nemecek, J. Šimůnek, J. Safrankova, L. Prech |
| 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 ; 22, no. 7 ; Nr. 22, no. 7 (2004-07-14), S.2441-2450 |
| Datensatznummer |
250014933
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2441-2004.pdf |
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| Zusammenfassung |
| Structured dispersion patterns of the ion precipitation in low- and mid-altitude
cusp regions have been reported by many authors.
These patterns are interpreted either as temporal features in terms of the
pulsed reconnection model or as spatial changes caused by a combination of the
particle velocity with the convection of magnetic field lines.
It is generally expected that the spatial dispersion
is predominantly observed in lower altitudes where the spacecraft crosses a wide
range of geomagnetic coordinates in a short time,
whereas the high-altitude spacecraft observes temporal changes because it stays
nearly on the same field line for a long time.
We have analyzed one pass of the INTERBALL-1/MAGION-4
satellite pair through the high-altitude cusp and found that both
temporal and spatial dispersion effects are important even in
the magnetopause vicinity. The analysis of the present event shows a spatial
nature of the observed dispersion in the LLBL and in the plasma mantle. We have
identified two sources of a mantle precipitation operating simultaneously.
Our investigations suggest that besides
already reported latitudinal dispersion, the longitudinal
dispersion can be observed during intervals of sufficiently high
east-west interplanetary magnetic field component. |
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