Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm41a09s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM41A-09
Physics
2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2788 Storms And Substorms
Scientific paper
The near geosynchronous spacecraft SCATHA acquired ion composition data during 1979, near the peak of solar cycle 21. There were several storm intervals at this time, and the SCATHA spacecraft monitored mass species up to and including singly charged oxygen in the energy range from 100 eV/q to 32 keV/q. The spacecraft covered the L-shell range from 5 to 9. The majority of the storm intervals were associated with significant increases in singly charged oxygen. Furthermore, the energy density of the oxygen as observed by SCATHA was more closely correlated with DST than the proton energy density. We also note that some of the oxygen ions were on nominally open drift paths. These observations support the recent suggestions that at least part of the storm-time DST signature is associated with particles on open drift paths. The two time constants that are often observed during recovery phase of a storm may therefore represent signatures of particles on open and closed drift paths with the former being lost from the magnetosphere on relatively short time scales, rather than species-dependent charge-exchange lifetimes.
Collin Henry L.
Strangeway Robert J.
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