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Density Irregularity of the Inner Corona determined from Simultaneous Measurements of the XUV and the K Coronal Brightness

Published online by Cambridge University Press:  19 July 2016

M. Guhathakurta ,
G.J. Rottmann ,
R.R. Fisher  and
F.Q. Orrall
M. Guhathakurta
Affiliation:
Laboratory for Atmospheric and Space Physics U. of Colorado, Campus Box 392 Boulder, CO, 80309-0392
G.J. Rottmann
Affiliation:
Laboratory for Atmospheric and Space Physics U. of Colorado, Campus Box 392 Boulder, CO, 80309-0392
R.R. Fisher
Affiliation:
High Altitude Observatory National Center for Atmospheric Research PO Box 3000 Boulder, CO 80307-3000
F.Q. Orrall
Affiliation:
Institute for Astronomy University of Hawaii 2680 Woodlawn Drive Honolulu, HI 96822

Abstract

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In this paper we report preliminary results from a study of the inner corona based on the direct comparison of XUV resonance emission line λ174.53 FeX with that of the white-light emission from the K corona. The data sets were obtained 17718th of March, 1988, during a total solar eclipse of the sun and consists of co-spatial and co-temporal measurements of these two quantities as a function of position angle and height above the solar limb. The local emission of a coronal resonance line is proportional to the electron density squared, the chemical abundance, and the electron kinetic temperature, while the white-light emission (arising from Thomson scattering by electrons) depends directly on the electron density and the local radiation field. Taken together these measurements yield an estimate of the quantity where n is the electron density. This quantity, called “X the coronal irregularity factor” by C.W. Allen, is found to be >1.

Type
VI. Chromospheric and Coronal Heating
Information
Symposium - International Astronomical Union , Volume 142: Basic Plasma Processes on the Sun , 1990 , pp. 253 - 254
Copyright
Copyright © Kluwer 1990 

References

Fisher, R.R. (1989). ‘In preparation’.Google Scholar
Guhathakurta, M. (1989). The large and small scale density structure of the solar corona. Ph.D. Thesis, University of Denver, Denver, Colorado.Google Scholar
Orrall, F.Q., Rottman, G.J., Fisher, R.R., and Munro, R.H. (1990). The solar coronal density irregularity (ñ2)/(ñ)2 derived from simultaneous measurements of the EUV and k-coronal brightness. Ap.J. , 349, in press.Google Scholar
Rottman, G.J. (1989). ‘In preparation’.Google Scholar