Broadening of the resonantly scattered H I Lyman Alpha line caused by Alfven waves

Details Broadening of the resonantly scattered H I Lyman Alpha line caused by Alfven waves Broadening of the resonantly scattered H I Lyman Alpha line caused by Alfven waves

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510261e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10261-10268. Research supported by the Smithsonian I

Physics

9

Coronal Holes, Line Spectra, Lyman Alpha Radiation, Magnetohydrodynamic Waves, Resonance Scattering, Solar Wind, Doppler Effect, Proton Density (Concentration), Solar Atmosphere, Velocity Distribution

Scientific paper

Alfven waves propagating outward from the coronal base set the solar wind into oscillatory motion. The effect of this wave motion on the broadening and shape of the spectral lines of the resonantly scattered Ly-alpha radiation emitted by a low-density coronal hole is investigated at heights above 1.5 Rs from sun center. Usually it has been assumed that the broadening due to waves can be characterized by a kinetic temperature proportional to the wave velocity amplitude squared, delta nu-squared. It is shown that the accuracy of this approximation depends on the wave velocity amplitude and the assumed wave spectrum.

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