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| Titel |
Cluster survey of the mid-altitude cusp – Part 2: Large-scale morphology |
| VerfasserIn |
F. Pitout, C. P. Escoubet, B. Klecker, I. Dandouras |
| 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. 5 ; Nr. 27, no. 5 (2009-05-04), S.1875-1886 |
| Datensatznummer |
250016506
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1875-2009.pdf |
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| Zusammenfassung |
| In this second part of our statistical study of the
mid-altitude cusp, we compare the cusp morphology, as seen in the Cluster
ion spectrometer (CIS), to the interplanetary magnetic field (IMF)
orientation. We first recall the method we have used a) to define the cusp
properties, b) to sort IMF conditions or behaviour in classes, c) to
determine the proper time delay between the solar wind monitors and Cluster.
Then, we define a few morphological features of the cusp and we relate these
to the prevailing IMF. Our results reveal, among other things, that the
occurrence of clearly dispersed ion structures in the cusp is 48%. From
these dispersions, we infer the distance to reconnection site, which we
relate to external conditions. In all other cases, the cusp exhibits a more
disturbed behaviour in terms of ion structures and fall in our
"discontinuous" or "irregular" categories. Among these, a few
interesting cases of discontinuous cusps occurring under stable IMF
conditions have been identified. They all occur when the IMF is dominated by
its Y-component, which plays in principle in favour of anti-parallel
reconnection but their wide MLT and latitudinal distributions is a priori
incompatible with the anti-parallel reconnection hypothesis solely. |
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