Coronal temperatures and temperature gradients from OSO-7 spectroheliograms

Details Coronal temperatures and temperature gradients from OSO-7 spectroheliograms Coronal temperatures and temperature gradients from OSO-7 spectroheliograms

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47..611n&link_type=abstract

Solar Physics, vol. 47, Apr. 1976, p. 611-626.

Physics

6

Far Ultraviolet Radiation, Solar Corona, Solar Temperature, Spectroheliographs, Temperature Gradients, Brightness, Isophotes, Line Spectra, Oso-7, Satellite-Borne Instruments, Ultraviolet Spectra

Scientific paper

Temperatures and temperature gradients for the outer corona are obtained from brightness gradients of EUV lines that were measured with the spectroheliograph on OSO-7. Brightness gradients show considerable deviations from isothermal model calculations that include collisional excitation and photoexcitation. A negative temperature gradient that gives both positive and negative ion-abundance gradients appears to be able to account for the discrepancy. For the 284-A of Fe XV, perhaps the strongest line from the outer corona, measurements during 1972 appear to be consistent with a temperature near 2.3 million K near the equator at about 1.3 solar radii from the solar center and with temperature-gradient values near -0.7 that extend from as low as 1.2 to about 1.8 solar radii. Temperatures from strong lines of Fe XIV and Fe XVI indicate that variations of about 200,000 K exist along lines of sight where emission is appreciable. There appears to be some agreement between these results and temperature measurements from ion abundances in the solar wind and the Doppler width of the 5303-A line.

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