Fluorescent excitation of photospheric Fe K-α emission during solar flares |
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| Authors: | AN Parmar JL Culhane CG Rapley KJH Phillips CJ Wolfson LW Acton BR Dennis |
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| Institution: | Mullard Space Science Laboratory, Department of Physics and Astronomy, University College London, Holmbury St. Mary, Dorking, Surrey, UK;Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK;Lockheed Palo Alto Research Laboratory, 3170 Porter Drive, Palo Alto, CA 94304, USA;NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA |
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| Abstract: | The Bent Crystal Spectrometer on the NASA Solar Maximum Mission satellite provides high spectral and temporal resolution observations of the Fe Kα lines. We have analysed spectra from almost 50 solar flares that occurred during 1980. These data strongly support fluorescent excitation of photospheric iron by photons of E > 7.11 keV emitted by the hot coronal plasma produced during the flare. After comparison of the data with a model, we discuss the observed Kα line widths, estimates of the size of the emitting region, the height of the coronal source and the photospheric iron abundance. |
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