Physics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996em%26p...74..231s&link_type=abstract
Earth, Moon and Planets, Volume 74, Issue 3, pp.231-242
Physics
Scientific paper
Energetic protons haying ring type distributions are shown to generate low-frequency electrostatic waves, propagating nearly transverse to the geomagnetic field lines, in the ring current region by exciting Mode 1 arid Mode 2 nonresonant instabilities and a resonant instability. Mode 1 nonresonant instability has frequencies around ~4 Hz with transverse wavelengths of ~(8 80) km, and it is likely to occur in the region L = (7 8). Mode 2 nonresonant instability can generate frequencies ~(850 1450) Hz with transverse wavelengths ~(2 20) km. The typical frequencies and transverse wavelengths associated with the resonant instability are (950 1250) Hz and (30 65) km. Both the Mode 2 nonresonant instability and the resonant instability can occur in the ring current region with L = (4 6). The low-frequency modes driven by energetic protons could attain maximum saturation electric field amplitude varying from 0.8 mV/m to 70 mV/m. It is suggested that the turbulence produced by the low-frequency modes may cause pitch angle scattering of ring current protons in the region outside the plasmapause resulting in the ring current decay.
Bharuthram R.
Lakhina Gurbax S.
Singh S. V.
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