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Spectroheliograms in the Mg II line at 2795.5 Å

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Abstract

A rocket-borne spectroheliograph designed to take monochromatic pictures of the sun in the Mgii line at 2795.5 Å was successfully launched from White Sands Missile Range on May 20, 1968. A double Šolc birefringent filter with a spectral bandpass of 2.1 Å was used to select the proper wavelength. Pinhole photographs in the soft X-ray region were also secured in the same flight. The Mgii and X-ray photographs are compared with simultaneous Caii and Hα spectroheliograms, radiomaps at 9.1 cm and 3.3 cm, a Fraunhofer map and a magnetogram and some preliminary results are discussed.

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Authors and Affiliations

  1. Goddard Space Flight Center, Greenbelt, Md., U.S.A.

    Kerstin Fredga

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  1. Kerstin Fredga
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NRC-NASA resident Research Associate. At present at the Astronomical Institute, Utrecht, The Netherlands on leave of absence from Stockholm Observatory, Sweden.

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Fredga, K. Spectroheliograms in the Mg II line at 2795.5 Å. Sol Phys 9, 358–371 (1969). https://doi.org/10.1007/BF02391658

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