HR: 08:20h
AN: SA11B-02 INVITED     [Abstracts]
TI: CRRES and DMSP Observations of Wave and Plasma Disturbances Associated with the Stormtime Ring Current in the Plasmasphere and Topside Ionosphere
AU: * Mishin, E V
EM: Evgenii.Mishin@hanscom.af.mil
AF: Boston College Institute for Scientific Research, 402 St. Clements Hall, Chestnut Hill, MA 02467 United States
AU: Burke, W J
EM: William.Burke2@hanscom.af.mil
AF: Air Force Research Laboratory, Space Vehicles Directorate, 29 Randolph Road, Hanscom AFB, MA 01731 United States
AB: We report on wave and plasma disturbances observed by Combined Release and Radiation Effects (CRRES) and Defense Meteorological Satellite Program (DMSP) satellites during the magnetic storm of June 5, 1991 in the region of ring current/plasmasphere overlap and the conjugate topside ionosphere During three ring current nose encounters near L = 2.4, the plasmasphere was highly-structured. A rich variety of wave phenomena were observed simultaneous with enhanced fluxes of low-energy ($<\sim$ 1 keV) electrons and ions, indicating the wave heating/acceleration source. Earthward of the plasma sheet boundary, which was near L = 5.5, wave-like structures in the dawn-to-dusk electric field with spatial wave-lengths from about 300 to 1000 km and magnitudes of ~1-3 mV/m were apparent. Mapped to ionospheric altitudes, these fields should produce broad irregular SAPS with average sunward velocities ~ 1 km/s. At about the same time DMSP F8, F9, and F10 indeed observed highly-structured SAPS in the topside ionosphere coincident with precipitating ring current ions, enhanced fluxes of suprathermal electrons and ions, elevated electron temperatures, and deep highly-irregular density troughs. Overall, these events represent the so-called strong wave-SAPS phenomenon [Mishin et al., JGR (2003), 108, 1309, 10.1029/2002JA009793]. Their importance for Space Weather is indicated by strong GPS phase and amplitude scintillations observed over the continental US [Basu et al., JGR, 106, 30389, 2001; Ledvina et al., GRL, 29, 10.1029/2002GL014770] coincident with similar events.
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2471 Plasma waves and instabilities
DE: 2716 Energetic particles, precipitating
DE: 2778 Ring current
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting