Hard X-ray imaging of two flares in active region 2372

Details Hard X-ray imaging of two flares in active region 2372 Hard X-ray imaging of two flares in active region 2372

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l.153h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Mar. 15, 1981, p. L153-L156. Research supported by the Dutch Mi

Astronomy and Astrophysics

Astrophysics

59

Solar Flares, Solar Maximum Mission, Solar Spectrometers, Solar X-Rays, X Ray Imagery, H Alpha Line, Power Spectra, Solar Magnetic Field, Temperature Effects, X Ray Spectra, X Ray Spectroscopy

Scientific paper

Hard X-ray images of two flares observed by the Hard X-ray Imaging Spectrometer (HXIS) aboard SMM on 1980 April 7 and 10 are discussed. A comparison with H-alpha images and the photospheric magnetic field maps shows that the emission originates in (arcades of) loops which differ greatly in the hardness of the X-ray spectra. On April 7 the hardest X-ray emission coincided with the brightest H-alpha patch. On April 10 the most intense X-ray emission appeared to be concentrated in a looplike structure with a softer spectrum at the top and a harder spectrum in the legs. Temperature estimates from flux ratios in different energy bands tend to confirm that small, hot components are embedded in more extensive, cooler flaring regions.

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