Enhanced He{I} Absorption at the Feet of Solar X-Ray Loops

Details Enhanced He{I} Absorption at the Feet of Solar X-Ray Loops Enhanced He{I} Absorption at the Feet of Solar X-Ray Loops

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48l...1v&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.L1-L4.

Astronomy and Astrophysics

Astronomy

4

Sun: Chromosphere, Sun: Corona, Sun: Spectra, Sun: Transition Region, Sun: X-Rays

Scientific paper

A comparison of He{I} spectroheliograms and Yohkoh soft X-ray images of active regions indicates that He{I} absorption is enhanced at the feet of hot X-ray loops. It is suggested that the conduction of heat from the loops into the transition region at their feet would produce enhanced transition-region emission around 50 eV that would in turn cause enhanced excitation of He{I} leading to the excess He{I} absorption that is observed.

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