Abstract
view Abstract Citations (83) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observation of Autoionizing States in the Solar Corona Walker, A. B. C., Jr. ; Rugge, H. R. Abstract We have observed weak satellites to the lines of the principal series of the heliumlike and hydrogenlike ions of magnesium, aluminum, silicon and sulfur in the solar spectrum. Tbese lines coincide in wavelength with the extrapolated positions of transitions from the 2s2p 3 and 2p2 `D autoionizing levels in heliumlike ions, and the ls2s2p 2p, Is2s3p 2P, and ls2p3p 23 or 2D autoionizing levels in lithiumlike ions. The observed ratio of the intensity of the ls2p `D line in Mg xi relative to the intensity of the Mg Xii La line is found to be 5 X l0- , compared with a predicted ratio which varies from 16 X 10-2 at 6>c 1O K to 7.5 X i0- at 1O K. These observations provide direct evidence of dielectronic recombination in the corona. Publication: The Astrophysical Journal Pub Date: February 1971 DOI: 10.1086/150828 Bibcode: 1971ApJ...164..181W full text sources ADS |
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