Energy spectra of the major ion species in the ring current during geomagnetic storms

Details Energy spectra of the major ion species in the ring current during geomagnetic storms Energy spectra of the major ion species in the ring current during geomagnetic storms

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3579k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3579-3599.

Physics

88

Energy Spectra, Magnetic Storms, Particle Energy, Positive Ions, Ring Currents, Electric Fields, Equatorial Atmosphere, Ion Motion, Satellite-Borne Instruments

Scientific paper

Nearly equatorial storm time energy spectra of the four major magnetospheric ions, H(+), O(+), He(+), and He(2+), obtained for the August 1984-November 1985 period by the charge-energy-mass spectrometer aboard the AMPTE/CCE spacecraft during the main and early recovery phases of all geomagnetic storms with minimum Dst of less than -50 nT were examined. It was found that, in the dawn-to-noon sector, there was a dip in the a spectra of all ions at 5-20 keV/e, while in the noon-to-dusk sector, the proton phase space density dropped off sharply below 5 keV. These spectra were compared with those predicted by a model of ion drift and loss in the magnetosphere. It was found that the spectra are most consistent with a Volland-Stern electric field with gamma = 2 and with a rotation of the nominal dawn-to-dusk electric field eastward by 2 hrs local time.

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