The X-ray image of the sun and its contribution to corona research. I

Details The X-ray image of the sun and its contribution to corona research. I The X-ray image of the sun and its contribution to corona research. I

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978s%26w....17..193e&link_type=abstract

Sterne und Weltraum, vol. 17, June 1978, p. 193-200. In German.

Astronomy and Astrophysics

Astronomy

Solar Corona, Solar Radio Emission, Solar X-Rays, Stellar Structure, X Ray Astronomy, X Ray Imagery, Photosphere, Quantitative Analysis, Solar Activity, Solar Limb, Solar Magnetic Field, Solar Temperature, Ultraviolet Radiation, X Ray Telescopes

Scientific paper

In the optical spectral region, the solar corona can only be observed during total solar eclipses or with the aid of a coronograph because its brightness is about a million times weaker than that of the photosphere. The inner part of the corona is, therefore, only visible at the solar limb, but not on the solar disk. Conditions are different for observations in the radio, XUV, and X-ray region because the photosphere in this wavelength region is practically black. Radio radiation is modified while passing through the corona. XUV and X-ray radiation, however, do in most cases not experience any changes. It is, therefore, possible to obtain on the basis of this radiation direct information concerning the conditions of the emitting regions. It has been found that the corona is composed of a great number of complex structures. Magnetic fields which have their origin in the photosphere extend into the plasma of the corona and determine its structure. Attention is given to imaging instruments in the soft X-ray region, quantitative analysis procedures, the various types of corona structures and their relations to the photospheric magnetic field, and studies of the activity regions.

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