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| Titel |
A summary of observational records on periodicities above the rotational period in the Jovian magnetosphere |
| VerfasserIn |
E. A. Kronberg, J. Woch, N. Krupp, A. Lagg |
| 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 ; 27, no. 6 ; Nr. 27, no. 6 (2009-06-25), S.2565-2573 |
| Datensatznummer |
250016569
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2565-2009.pdf |
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| Zusammenfassung |
| The Jovian magnetosphere is a very dynamic system. The plasma
mass-loading from the moon Io and the fast planetary rotation lead to regular
release of mass from the Jovian magnetosphere and to a change of the magnetic
topology. These regular variations, most commonly on several (2.5–4) days
scale, were derived from various data sets obtained by different spacecraft
missions and instruments ranging from auroral images to in situ measurements
of magnetospheric particles. Specifically, ion measurements from the Galileo
spacecraft represent the periodicities, very distinctively, namely the
periodic thinning of the plasma sheet and subsequent dipolarization, and
explosive mass release occurring mainly during the transition between these
two phases. We present a review of these periodicities, particularly
concentrating on those observed in energetic particle data. The most distinct
periodicities are observed for ions of sulfur and oxygen. The periodic
topological change of the Jovian magnetosphere, the associated mass-release
process and auroral signatures can be interpreted as a global magnetospheric
instability with analogies to the two step concept of terrestrial substorms.
Different views on the triggering mechanism of this magnetospheric
instability are discussed. |
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