Published September 1969
| Published
Journal Article
Open
Interpretation of XUV spectroheliograms
- Creators
- Zirin, Harold
Chicago
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Abstract
Some parameters of chromospheric structure are drawn from recently published XUV spectroheliograms. The HeII emission above the limb arises from the small amount of He⁺ still existing at 10⁶°. The larger amounts of He⁺ in the cooler corona at the poles explain the polar cap absorption in λ 304. The flat distribution of emission in OIV and OV, with a sharp spike at the limb, is caused by the rough structure of the chromosphere and the variable excitation in the emitting spicules. The intensity of the NeVII lines shows that the transition zone between chromosphere and corona is very sharp.
Additional Information
© 1969 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 27 February 1969; Issue Date September 1969. This research was supported by the National Aeronautics and Space Administration under Grant NASA NGR 05 002 034. I am grateful to Drs. R. N. Tousey and J. D. Purcell for the opportunity to examine their original plates, as well as stimulating discussions of this problem.Attached Files
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Additional details
- Eprint ID
- 104179
- Resolver ID
- CaltechAUTHORS:20200701-081152491
- NASA
- NGR 05 002 034
- Created
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2020-07-01Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field