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Title: Wide-band whistler-mode limiting magnetic field intensity and measurement of strength of pitch angle diffusion of resonant electron
Authors: Prakash, Ram
Singh, R P
Issue Date: Dec-1994
Publisher: NISCAIR-CSIR, India
Abstract: Following linear theory and adopting the well known Fokker Planck expression for diffusion coefficient, expressions for the limiting magnetic field intensity of wide-band whistler-mode waves and the diffusion parameter have been derived. The diffusion parameter is shown to be equal to the ratio of the experimentally observed intensity to the limiting intensity. In order to measure diffusion strength, the theoretically calculated limited magnetic field intensities are then compared with the magnetic field intensities observed experimentally both inside and outside the plasmasphere. The results show that strong diffusion is impossible at L 4, implying that the whistler-mode magnetic field intensity can never exceed its limiting value at such L values. The results at 4.5 L 8 both inside and outside the plasmasphere favour strong diffusion without ruling out, however, the occasional possibility of weak diffusion. The region of transition from weak to strong diffusion is found to lie at L = 4.5 ± 0.25. The results also indicate that the diffusion strength increases with increasing L values.
Page(s): 403-409
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.23(6) [December 1994]

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