Abstract
view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Identification of the Spurious D3 Helium Emission from the Solar Corona. Zirin, Harold ; James, Robert ; Watson, D. Keith Abstract Gnevyshev has discussed observations of emission in the D3 helium line appearing on spectrograms of the solar corona. We have found that this emission appears on spectrograms as a result of chromospheric emission scattered by secondary optics of the coronagraph. Successive spectrograms were made at Climax with the sun over- and under-occulted. On the under-occulted spectrograms, in which chromospheric light could reach the secondary optics, D3 was invariably observed. In the under-occulted coronagrams it was never observed. The profile of the spurious D3 line in the underocculted coronagrams is similar to that in the chromosphere. Publication: The Astronomical Journal Pub Date: 1964 DOI: 10.1086/109415 Bibcode: 1964AJ.....69Q.565Z full text sources ADS |
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