Dense ion clouds of 0.1 ? 2 keV ions inside the CPS-region observed by Astrid-2

S. H. Høymork (1) , M. Yamauchi (1) , Y. Ebihara (1) , Y. Narita (1) , O. Norberg (1) , D. Winningham (2)

1 IRF - Swedish Institute of Space Physics [Kiruna]
2 SwRI - Southwest Research Institute [San Antonio]

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.

Domaines: Océan, Atmosphère; Sciences de la Terre

S. H. Høymork, M. Yamauchi, Y. Ebihara, Y. Narita, O. Norberg, et al.. Dense ion clouds of 0.1 ? 2 keV ions inside the CPS-region observed by Astrid-2. Annales Geophysicae, 2001, 19 (6), pp.621-631. ⟨hal-00316858⟩