Yokhoh Soft X-Ray Telescope Images of the Diffuse Solar Corona

Details Yokhoh Soft X-Ray Telescope Images of the Diffuse Solar Corona Yokhoh Soft X-Ray Telescope Images of the Diffuse Solar Corona

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461l.115s&link_type=abstract

Astrophysical Journal Letters v.461, p.L115

Astronomy and Astrophysics

Astronomy

34

Sun: Corona, Sun: X-Rays, Gamma Rays

Scientific paper

During the interval 1992 May 3--15, an extended region (out to 1.5 solar radii) of diffuse, stable corona crossed the northeast limb of the Sun. This region underlaid a coronal streamer as revealed by the Mauna Loa Coronagraph of the High Altitude Observatory. During this passage, the soft X-ray telescope on Yohkoh obtained a number of high-quality pairs of images, closely spaced in time, through the two thinnest analysis filters. Analysis of these data indicates that (1) the temperature increases steadily with height and (2) the variation of temperature with radius is consistent with a conserved inward heat flux. These results imply that the magnetic field configuration was substantially open out to 1.5 solar radii and that there was no significant coronal heating below that height in that region. It appears that this region was being heated by nonthermal energy deposited beyond 1.5 solar radii.

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