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| Titel |
The statistical studies of the inner boundary of plasma sheet |
| VerfasserIn |
J. B. Cao, W. Z. Ding, H. Rème, I. Dandouras, M. Dunlop, Z. X. Liu, J. Y. Yang |
| 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 ; 29, no. 2 ; Nr. 29, no. 2 (2011-02-08), S.289-298 |
| Datensatznummer |
250016968
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| Publikation (Nr.) |
 copernicus.org/angeo-29-289-2011.pdf |
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| Zusammenfassung |
| The penetration of plasma sheet ions into the inner magnetosphere is very
important to the inner magnetospheric dynamics since plasma sheet ions are
one of the major particle sources of ring current during storm times.
However, the direct observations of the inner boundary of the plasma sheet
are fairly rare due to the limited number of satellites in near equatorial
orbits outside 6.6 RE. In this paper, we used the ion data recorded by
TC-1 from 2004 to 2006 to study the distribution of inner boundary of ion
plasma sheet (IBIPS) and for the first time show the observational
distribution of IBIPS in the equatorial plane. The IBIPS has a dawn-dusk
asymmetry, being farthest to the Earth in the 06:00 08:00 LT bin and closest
to the Earth in the 18:00–20:00 LT bin. Besides, the IBIPS has also a
day-night asymmetry, which may be due to the fact that the ions on the
dayside are exposed more time to loss mechanisms on their drift paths. The
radial distance of IBIPS decrease generally with the increase of Kp index.
The mean radial distance of IBIPS is basically larger than 6.6 RE during
quiet times and smaller than 6.6 RE during active times. When the
strength of convection electric field increases, the inward shift of IBIPS
is most significant on the night side (22:00–02:00 LT). For Kp ≤ 0+,
only 16% of IBIPSs penetrate inside the geosynchronous orbit. For 2 ≤ Kp < 3+,
however, 70% of IBIPSs penetrate inside the geosynchronous
orbit. The IBIPS has weak correlations with the AE and Dst indexes. The
average correlation coefficient between Ri and Kp is −0.58 while the
correlation coefficient between Ri and AE/Dst is only −0.29/0.17. The
correlation coefficients are local time dependent. Particularly, Ri and
Kp are highly correlated (r=−0.72) in the night sector, meaning that the
radial distance of IBIPS Ri in the night sector has the good response to
the Kp index These observations indicate that Kp plays a key role in
determining the position of IBIPS. |
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