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| Titel |
Comparative time-series analysis of MeV electron data by Ulysses and Pioneer 10/11 in the Jovian magnetosphere |
| VerfasserIn |
P. Dunzlaff, B. Heber, A. Kopp, M. S. Potgieter |
| 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 ; 31, no. 10 ; Nr. 31, no. 10 (2013-10-16), S.1721-1730 |
| Datensatznummer |
250086124
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1721-2013.pdf |
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| Zusammenfassung |
| The dynamics of the Jovian magnetosphere is dominated by the planet's fast
rotation with a period of ~ 10 h. Within the magnetosphere, this
periodicity can in particular be seen in the temporal variation of the
spectral index of MeV electrons: every ~ 10 h the counting rates show
a maximum (minimum), while the spectral index shows a minimum (maximum) known
as the Jovian "clock" mechanism. In this study we re-analyse Ulysses and
Pioneer 10/11 data and show that another periodic modulation in the MeV
electrons can be identified, manifested by local maxima of the spectral index
and local minima of the counting rates. For Ulysses, this modulation can be
observed throughout the magnetosphere near the magnetic equator, suggesting
an azimuthal asymmetric distribution of MeV electrons near the current sheet.
This modulation is found to trail the "clock" mechanism by ~ 3.25 h.
The Pioneer 10 data, however, only show occasional evidence of the presence
of these local maxima while there is no evidence of this modulation in the
Pioneer 11 data. A comparison of the times of observed minor peaks and
Ulysses' distance from the current sheet using a simple rigid disc model as
well as the model of Khurana and Schwarzl (2005) is performed. |
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