Please use this identifier to cite or link to this item: http://library.iigm.res.in:8080/xmlui/handle/123456789/956
Title: Low-frequency electric field fluctuations excited by ring current protons
Authors: Singh, S.V.
Lakhina, G.S.
Bharuthram, R.
Keywords: Electric field
Energetic protons
Electrostatic waves
Issue Date: 1996
Citation: Earth, Moon, and Planets, v.74/3, p.231-242, 1996, doi: 10.1007/BF00055189
Abstract: 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.
URI: http://localhost:8080/xmlui/handle/123456789/956
Appears in Collections:UAS_Reprints

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