Long-period (~1-3 hours) storm-time DP-1 and DP-2 geomagnetic variation effects in
radiation belts are analyzed. We use the Molniya-1 satellite (~40,000-km apogee,
500-km perigee, ~63o inclination) data to demonstrate the DP-2 variation effect on
radiation belt particles. The non-stationary peaks in proton spectra on L~2.5 occur
due to the giant quasi-periodic DP-2 variations, whose periods coincide with the
proton drift periods on the respective L-shells. The giant DP-2 variation amplitude
may reach ~1000 nT in a sunlit polar cap. We analyze the quasiperiodic geomagnetic
disturbances for the 25 May 1967 storm (Dst~400 nT) to explain the resonant
acceleration of >280 keV electrons measured on the 1963 58C satellite in the inner
radiation belt. The quasi-periodic (a few hours) variations of the relativistic electron
intensity in a geostationary orbit are studied basing on the GOES 8 and 10
measurements and on the ACE interplanetary data. The results obtained support the
self-excited quasiperiodic substorm occurrence under persistent southward
orientation of IMF observed 3 decades ago. The relevance of named variations for
the geomagnetic storm development features is discussed.
Номер документа: 2004 - 10/749
Авторы: L. V. Tverskaya, M. I. Panasyuk, E. N. Sosnovets
Email: [email protected]