Dynamical effects in resonant scattering by interplanetary helium

Details Dynamical effects in resonant scattering by interplanetary helium Dynamical effects in resonant scattering by interplanetary helium

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78...41w&link_type=abstract

Astronomy and Astrophysics, vol. 78, no. 1, Sept. 1979, p. 41-45. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

3

Helium, Interplanetary Gas, Resonance Scattering, Solar Radiation, Gas Heating, Gas Temperature, Line Spectra, Photons, Ultraviolet Radiation

Scientific paper

The thermal description of interplanetary helium gas flow in the solar gravitational and radiation fields is used to construct expected line profiles from resonant scattering of solar 584 A radiation, ignoring collisional heating and photon multiple scattering. Profiles from 1 AU in anti-solar directions are shown to agree closely with results from full computations, except for the minor secondary peaks. The analytic formula derived for cold gas is accurate for 1000 K helium. Total intensities are generally given with surprising accuracy by the thermal model, though further checks are desirable on the density formula in the gravitationally-focused tail and on integrals along lines-of-sight passing well inside 1 AU.

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