Ring current development during the great geomagnetic storm of February 1986

Details Ring current development during the great geomagnetic storm of February 1986 Ring current development during the great geomagnetic storm of February 1986

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314343h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14343-14355.

Physics

238

Earth Magnetosphere, Geomagnetism, Magnetic Storms, Ring Currents, Ampte (Satellites), Charged Particles, Energy Spectra, Particle Flux Density, Sudden Storm Commencements

Scientific paper

The variations of the ring current energy density and composition during the great magnetic storm of February 1986 were investigated using particle measurements obtained by the charge-energy-mass instrument on the AMPTE Charge Composition Explorer spacecraft. The ring current composition of this storm, which had a complicated main phase and a minimum Dst of -312 nT on February 9, was followed for five days from the prestorm quiet time to the early recovery phase. Results suggested that the very rapid initial Dst recovery (tau of about 9.3 hrs) in this storm resulted largely from the rapid loss of 75- to 100-keV O(+) via charge exchange in the inner portion of the ring current. It is proposed that a major O(+) + N(+) ring current component generally exists near the maximum phase of great storms.

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