Analysis and interpretation of soft X-ray photographs of coronal active regions taken with Fresnel zone plates. I - Image analysis

Details Analysis and interpretation of soft X-ray photographs of coronal active regions taken with Fresnel zone plates. I - Image analysis Analysis and interpretation of soft X-ray photographs of coronal active regions taken with Fresnel zone plates. I - Image analysis

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..345k&link_type=abstract

Solar Physics, vol. 57, Apr. 1978, p. 345-367. Bundesministerium für Forschung und Technologie Deutsche Forschungsgemeinschaft

Physics

2

Fresnel Diffraction, Solar Activity, Solar Corona, Solar X-Rays, X Ray Imagery, Aberration, Data Reduction, Emission Spectra, Line Spectra, Solar Spectra, Solar Temperature, Thermal Mapping, X Ray Diffraction

Scientific paper

Soft X-ray photographs of the sun taken at O VII 21.6 A and in a spectral band ranging from 13.2 to 22.1 A have been analyzed in order to establish spatially resolved maps of temperature and emission measure for several active regions in the corona. The photographs were taken with Fresnel-zone-plate cameras flown on sounding rockets. This paper deals with those aspects of the instrumentation which are important for setting up a suitable image-analysis procedure. The characteristics of the wavelength-dependent image formation by zone plates combined with absorption filters are discussed. Results of the calibration of the X-ray film are given. A specific iterative data-reduction procedure is described, and the resulting maps of temperature and emission measure are presented for a selected active region.

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