Numerical calculation of Thomson scattering from inhomogeneous models of the corona,and application to streamers of the 1970 and 1972 eclipses |
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| Authors: | Bohlin J D Garrison L M |
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| Institution: | (1) E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375 Washington, D.C., U.S.A.;(2) Present address: Washburn Observatory, University of Wisconsin, 53706 Madison, Wis., U.S.A. |
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| Abstract: | A general computer program has been developed to numerically integrate the Thomson scattered light from arbitrary inhomogeneous models of the solar corona. Conversion from the observer's to solar coordinates is totally general to eliminate restrictions on the lines-of-sight that may be investigated. The tangential and radial components (K
t
and K
r
),or any combination thereof, are calculated. Four separate output modes are available, corresponding to the common formats used for coronal brightness and polarization data.This program was used to investigate the major NW streamer of the 1972 eclipse. The bifurcated profile of this feature is reproduced by the projection effect of a radially expanding blade, or fan, whose longitudinal axis is twisted to follow an underlying magnetic neutral line on the solar surface. Thus a purely geometrical effect accounts for the observed intensity profile. Published brightness data for the NE streamer of the 1970 eclipse are also reinterpreted using the radially-expanding fan model. The axial density gradients of 1970 and 1972 features are found to be virtually identical from 3 to 8 R
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