Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0534t&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0534
Other
2752 Mhd Waves And Instabilities, 2760 Plasma Convection, 2768 Plasmasphere
Scientific paper
The magnetosphere often "rings" in the Pc5 frequency range (few minutes) in response to the sudden impulse imparted by an interplanetary shock, as well as to other less-obvious stimuli. At geosynchronous orbit, this ringing is manifested in largely-azimuthal flow oscillations of the outer plasmasphere, as observed by Los Alamos MPA instruments on several satellites. If the amplitude of these Pc5 pulsations is large enough, the different mass species of the plasmasphere (H+, He+, and O+) can be separated by E/q in the MPA analyzer, enabling the determination of the composition of the plasmaspheric material. For example, Pc5 oscillations on 25 Sep 2001, stimulated by the passage of an interplanetary shock at 2026 UT, reveal the presence of a substantial population of He+ and O+ in the duskside outer plasmasphere, whereas simultaneous observations by a different satellite near dawn show a smaller proportion of heavy ions. The results of a search for such events will be presented.
Borovsky Joseph E.
Elphic Richard C.
Friedel Reiner H.
Thomsen Michelle F.
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