Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615963s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,963-15,972. Research supported by ISRO.
Physics
20
Atmospheric Radiation, Computerized Simulation, Monte Carlo Method, Solar Planetary Interactions, Uranus Atmosphere, Extreme Ultraviolet Radiation, Field Aligned Currents, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence
Scientific paper
A Monte Carlo simulation of photoelectron energization and energy degradation in H2 gas in the presence of parallel electric fields has been carried out. Numerical yield spectra which contain information about the electron energy degradation process and can be used to calculate the yield for any inelastic event are obtained. The variation of yield spectra with incident electron energy, electric field, pitch angle, and cutoff limit has been studied. The yield function is employed to determine the photoelectron fluxes. H2 Lyman and Werner band excitation rates and integrated column intensity are computed for three different electric field profiles taking various low-energy cutoff limits. It is found that an electric field profile with peak value of 4 mV/m at neutral number density of 3 x 10 to the 10th/cu cm produces enhanced volume emission rates of H2 bands less than 1100-A forbidden lines explaining about 20 percent of the observed electroglow emission on Uranus. The effect of solar zenith angle and solar cycle variation on peak excitation rate is discussed.
Bhardwaj Anil
Singhal R. P.
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