Analysis of coronal H I Lyman alpha measurements from a rocket flight on 1979 April 13

Details Analysis of coronal H I Lyman alpha measurements from a rocket flight on 1979 April 13 Analysis of coronal H I Lyman alpha measurements from a rocket flight on 1979 April 13

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..361w&link_type=abstract

Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p.361-370. Research supported by the Consiglio Nazionale delle Ricerche

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34

H Alpha Line, Lyman Alpha Radiation, Resonance Scattering, Solar Corona, Solar Spectra, Spectral Line Width, Rocket Sounding, Solar Protons, Solar Wind, Two Fluid Models, Ultraviolet Spectra

Scientific paper

It is noted that measurements of the profiles of resonantly scattered hydrogen Lyman-alpha coronal radiation have been used in determining hydrogen kinetic temperatures from 1.5 to 4 solar radii from sun center in a quiet region of the corona. Proton temperatures derived using the line widths decrease with height from 2.6 x 10 to the 6th K at 1.5 solar radii to 1.2 x 10 to the 6th K at 4 solar radii. These measurements, together with temperatures for lower heights determined from earlier Skylab and eclipse data, suggest that there is a maximum in the quiet coronal proton temperature at about 1.5 solar radii. Comparison of measured Lyman-alpha intensities with those calculated using a representative model for the radial variation of the coronal electron density yields information on the magnitude of the electron temperature gradient and suggests that the solar wind flow was subsonic for distances less than 4 solar radii.

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