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Solar Heii(304 Å) and Sixi(303 Å) line profiles

✍ Scribed by G. W. Cushman; W. A. Rense

Publisher
Springer
Year
1978
Tongue
English
Weight
310 KB
Volume
58
Category
Article
ISSN
0038-0938

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✦ Synopsis

Additional observations of He II (304 &) and Si xI (303 ~) were obtained from a high resolution rocket spectrograph flown on 30 August, 1973 and 20 January, 1975. The profile of the He ri (304 ~) line is everywhere clearly non-gaussian across the solar disk, except in bright active areas. Near the limb, the profile is distinctly reversed. The profile of the Si xr (303 *) line is essentially gaussian for all regions across the solar disk. Measurements of the He II/Si xr intensity ratio indicate that the average value of this ratio across the disk depends markedly on solar activity, being about 10:1 for a moderate level of activity and 30 : 1 for a quiet Sun.

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