A Caltech Library Service

Interpretation of XUV spectroheliograms

Zirin, Harold (1969) Interpretation of XUV spectroheliograms. Solar Physics, 9 (1). pp. 77-87. ISSN 0038-0938. doi:10.1007/bf00145730.

[img] PDF (ADS) - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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
Related URLs:
URLURL TypeDescription
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.
Funding AgencyGrant Number
NASANGR 05 002 034
Subject Keywords:Transition Zone; Flat Distribution; Sharp Spike; Rough Structure; Chromospheric Structure
Issue or Number:1
Record Number:CaltechAUTHORS:20200701-081152491
Persistent URL:
Official Citation:Zirin, H. Interpretation of XUV spectroheliograms. Sol Phys 9, 77–87 (1969).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104179
Deposited By: Tony Diaz
Deposited On:01 Jul 2020 16:42
Last Modified:16 Nov 2021 18:29

Repository Staff Only: item control page