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Ann. Geophys., 19, 621-631, 2001
www.ann-geophys.net/19/621/2001/
© European Geosciences Union 2001
Dense ion clouds of 0.1 − 2 keV ions inside the CPS-region observed by Astrid-2
S. H. Høymork1, M. Yamauchi1, Y. Ebihara1, Y. Narita1, O. Norberg1, and D. Winningham2
1Swedish Institute of Space Physics, Kiruna, Sweden
2Southwest Research Institute, San Antonio, USA
Abstract. Data from the Astrid-2
satellite taken between April and July 1999 show several examples of dense ion
clouds in the 0.1–2 keV energy range inside the inner mag-netosphere, both in
the northern and southern hemispheres. These inner magnetospheric ion clouds
are found predomi-nantly in the early morning sector, suggesting that they
could have originated from substorm-related ion injections on the night side.
However, their location and density show no cor-relation with Kp, and
their energy-latitude dispersion is not easily reproduced by a simple particle
drift model. There-fore, these ion clouds are not necessarily caused by
substorm-related ion injections. Alternative explanations for the ion clouds
are the direct solar wind injections and up-welling ions from the other
hemisphere. These explanations do not, however, account for all of the
observations.
Key words. Magnetospheric physics
(energetic particles, trapped; magnetospheric configuration and dynamics; storm
and substorms)
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