Horizontal distribution of the X-ray energy deposit in the chromosphere and H alpha two ribbon flares

Details Horizontal distribution of the X-ray energy deposit in the chromosphere and H alpha two ribbon flares Horizontal distribution of the X-ray energy deposit in the chromosphere and H alpha two ribbon flares

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..322h&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 322-327.

Astronomy and Astrophysics

Astrophysics

7

Chromosphere, H Alpha Line, Radiation Distribution, Solar Flares, Solar X-Rays, X Ray Sources, Coronal Loops, Emission Spectra, Particle Energy, Plasma Density, Plasma Temperature, Solar Atmosphere

Scientific paper

The two-ribbon Hα brightening and the X-ray emitting coronal loop arcade during the very late phase of the 29 July 1973 flare are examined. By means of a simple geometrical model of the X-ray emitting structures, the horizontal distribution of X-radiation is computed for several different levels in the chromosphere. It is found that an arcade of X-ray emitting loops, commonly found over large two-ribbon flares, gives an energy deposit pattern in the chromosphere similar in shape to the Hα flare emission. Isophotes of the Hα brightening are compared to the X-ray energy deposit horizontal variation profiles from a single loop and from an arcade of loops. The brightest 29 July isophotes fit midway between the X-ray profiles associated respectively with a loop and an arcade. The maximum X-ray energy deposit rate of 1.5 106 ergs cm-2 s-1 is slightly higher than the peak Hα emission rate. It is concluded that X-ray radiation is an important source of energy for Hz flares. There seems to be no need for in- situ energy release in the chromosphere.

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