Zirin, Harold (1969) Interpretation of XUV spectroheliograms. Solar Physics, 9 (1). pp. 77-87. ISSN 0038-0938. https://resolver.caltech.edu/CaltechAUTHORS:20200701-081152491
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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.
| Item Type: | Article | |||||||||
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| 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. | |||||||||
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| Subject Keywords: | Transition Zone; Flat Distribution; Sharp Spike; Rough Structure; Chromospheric Structure | |||||||||
| Issue or Number: | 1 | |||||||||
| Record Number: | CaltechAUTHORS:20200701-081152491 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200701-081152491 | |||||||||
| Official Citation: | Zirin, H. Interpretation of XUV spectroheliograms. Sol Phys 9, 77–87 (1969). https://doi.org/10.1007/BF00145730 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 104179 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 01 Jul 2020 16:42 | |||||||||
| Last Modified: | 01 Jul 2020 16:42 |
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