Observations of the Solar Spectrum in the Region 150 A to 870 A Emitted from the Disk and Above the Limb

Abstract

Photographic spectra have been obtained in the grazing-incidence region from a position on the quiet solar disk and from a region just above the visible limb. The payload, which was launched on a Sun-stabilized Skylark rocket, contained three grazing-incidence spectrographs, each illuminated by a two-component grazing-incidence telescope mirror. One of these, which was viewing the limb spectrum, was fitted with a fine-alignment servo system to stabilize the image. A careful intensity calibration will enable the data to be analysed in terms of limb/disk intensity ratios, and absolute intensities. The present paper presents a full identification of the spectra, which includes a number of intersystem transitions, notably in iron ions.