Physics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..694s&link_type=abstract
Journal of Geophysical Research, vol. 80, Feb. 1, 1975, p. 694, 695.
Physics
4
Group Velocity, Gyrofrequency, Ion Cyclotron Radiation, Ionospheric Propagation, Proton Energy, Whistlers, Ionospheric Ion Density, Plasma Diagnostics, Proton Density (Concentration), Satellite Observation, Time Lag, Wave Dispersion
Scientific paper
A theoretical relation is derived for the group travel time of the proton whistlers to reach the satellite from their place of occurrence. The expression for the group travel time contains two terms. The first term is the dominant term and is inversely proportional to the square root of the difference between proton gyrofrequency and wave frequency. The contribution from the second term, which is inversely proportional to the 7/2 power of the difference between proton gyrofrequency and wave frequency, is about 10% of the first term. It is shown that the group travel time is sensitive to the variation of temperature, gradient of proton gyrofrequency, and ion density along the path of a proton whistler. The effect of variation in each of the above parameters on the group travel time is discussed, and it is shown that an estimate of proton temperature can be made from the measured data on the proton whistlers.
Singh Shubh Narayan
Tolpadi S. K.
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