Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10.1211b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, Dec. 1983, p. 1211-1214. Research supported by the U.S. Department of En
Physics
4
Heavy Ions, Ion Charge, Magnetically Trapped Particles, Magnetospheric Ion Density, Plasma Drift, Helium Ions, Ion Stripping, Proton Energy, Solar Wind
Scientific paper
The mean charge states of heavy ions trapped in the earth's magnetosphere are important parameters for distinguishing among magnetospheric theories. No direct measurements have been made at energies greater than about 50 keV. A technique, which uses the E/q dependence of ion drift velocity, is described in this letter. A drift-echo event, which followed a substorm that occurred at 2100-2200 UT on February 25, 1979, is discussed to illustrate the application of this technique. In this event, the charge state of helium ions was +2 and that of CNO ions was greater than +2 and probably not less than +5. This result implies that the drift-echo particles were from freshly injected solar wind plasma.
Baker Daniel N.
Belian Richard D.
Bernard Blake J.
Fennell Joseph F.
Higbie Paul R.
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