Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..255f&link_type=abstract
Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 5, Oct. 1987, p. 255-263.
Physics
14
Extreme Ultraviolet Radiation, Helium, Interplanetary Medium, Plasma Resonance, Solar Radiation, Gas Ionization, Plasma Density, Solar Cycles, Time Dependence
Scientific paper
An evaluation of time-dependent interplanetary glow models is presented in light of variations noted in the ionizing and resonating solar radiation fields over the solar activity cycle. Upwind and downwind helium densities and HeI-584 A glow intensities derived with exact solutions of the time-dependent Boltzmann equations are compared with those derived from conventional stationary solutions, revealing deviations of 10-20 percent in the intensities for conditions of time variability. If local ISM helium densities are determined from upwind intensities and local ISM temperatures from downwind intensities, the use of stationary models is shown to lead to misinterpretations of data.
Fahr Hans Jörg
Nass H. U.
Ruciński Daniel
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