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| Titel |
Statistical study of the proton isotropy boundary |
| VerfasserIn |
E. A. Lvova, V. A. Sergeev, G. R. Bagautdinova |
| 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 ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1311-1316 |
| Datensatznummer |
250015225
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1311-2005.pdf |
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| Zusammenfassung |
| Based on a large data set of polar NOAA-type satellite observations
we studied the latitude-MLT shape of the 80keV proton isotropy
boundary (IB) as a function of the solar wind parameters and
magnetic activity. Using "snapshots" of isotropy boundaries
near-simultaneously crossed at four points we found that its
equatorward expansion, as well as its dawn-dusk shift, depends
mostly on the AE-index and on the corrected Dst*, whereas the
amplitude of the IB daily variation is mostly controlled by the
solar wind dynamic pressure. Applying a nonlinear, multi-parametric,
least-square regression procedure, the empirical relationship
describing the IB latitude as a function of MLT and AE, Pd, Dst* parameters was obtained. Comparing it with the predictions from the
Tsyganenko-2001 model we found a good agreement during the quiet
time but some important differences during the disturbed periods.
Interpretation of these results in terms of the properties of the
magnetospheric configuration is briefly discussed. |
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