Spatial Variability of the Solar X-ray Spectrum below 20 Å

Details Spatial Variability of the Solar X-ray Spectrum below 20 Å Spatial Variability of the Solar X-ray Spectrum below 20 Å

Oct 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.220...48n&link_type=abstract

Nature, Volume 220, Issue 5162, pp. 48-50 (1968).

Physics

2

Scientific paper

X-RAY images of the Sun have recently been obtained in a number of relatively narrow wavelength bands below 20 Å. The instrument consisted of a gas-filled proportional counter with a six channel pulse-height discriminator to provide energy resolution1. To provide spatial resolution and increase the collecting area of the detector a method discussed by Giacconi and Rossi was used2. This involved the use of a grazing incidence paraboloidal mirror, a small stop in the focal plane of which limited the field of view to a half-angle α = r/(1-d) (Fig. 1). By a suitable choice of r the field of view was reduced to a fraction of that subtended by the whole Sun. An image was built up by scanning the instrument in a systematic way across the Sun.

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