Other
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..799c&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 15, 1979, p. 799-811.
Other
1
Solar Corona, Solar Prominences, Solar Temperature, Solar X-Rays, Spectroheliographs, Electron Density (Concentration), Helium, High Temperature, Iron, Line Spectra, Loops, Oso-7, Solar Flares, Solar Flux Density, Ultraviolet Spectra
Scientific paper
Flare-associated coronal loops were observed on the SE limb of the sun of 1972 February 9 by the Goddard X-ray and EUV spectroheliograph on board OSO 7. The loop structure is clearly visible in the lines of Mg VIII and Mg IX, whereas little or no detail is observed in Fe XV and Fe XVI. A looplike structure with a cloud of emission at the top is observed in soft X-rays. The temperature structure in the region has been calculated from the ratio Fe XVI/Fe XV. The isothermal contour plot is strikingly similar to the isointensity contour plots of the soft X-ray spectroheliograms. With these temperatures and the Fe XV intensity calculated from a calibration scheme developed by Chapman and Neupert, the emission measure has been estimated in the loops. Calculated energy losses suggest that continued deposition of energy is required over the observing period.
Chapman Robert Dewitt
Neupert Werner M.
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