Extreme ultraviolet emission from chromospheric inhomogeneities |
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| Authors: | G E Brueckner K R Nicolas |
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| Institution: | (1) E. O. Hulbert Center for Space Research, Naval Research Laboratory, Washington, D.C., U.S.A. |
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| Abstract: | An Aerobee 170 rocket carried five slitless extreme ultraviolet (XUV) spectroheliographs into the March 7, 1970, solar eclipse. Salt water damage left latent images on 16 exposures of the XUV camera covering the wavelength range from 1390 Å to 1945 Å. The salt water damage made the absolute calibration of the spectroheliograms uncertain. Therefore, the analysis in this paper is based on a comparison of the extent of flash spectrum crescents from emission lines formed in the chromosphere-corona transition zone with two simple but fundamentally different models describing this region. The observations can be satisfactorily described by an inhomogeneous model where cool spicules are surrounded by a transition zone which has the same temperature and density structure as the chromospheric coronal transition zone customarily used in spherically symmetric models of the quiet Sun.Also associated with the Astronomy Program, University of Maryland, College Park, Md., U.S.A. |
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