HeII λ304 emission above sunspot umbrae

Details HeII λ304 emission above sunspot umbrae HeII λ304 emission above sunspot umbrae

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011arep...55..159z&link_type=abstract

Astronomy Reports, Volume 55, Issue 2, pp.159-162

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations of sunspot umbrae in the HeII λ304 Å and HeI λ10830 Å lines are analyzed and compared. Spectral observations in the HeI λ10830 line obtained on the Large Non-Eclipse Solar Coronograph of the Sayan Solar Observatory are used, together with HeII λ304 data obtained with the SOHO/EIT and CORONAS-f spacecraft. The contrast in the HeII λ304 line was chosen as an indicator of the UV flux. The dependences of the contrast in the HeII λ304 line and the parameters of the HeI λ10830 IR triplet on the sunspot area are obtained. The sunspot areas were determined using white-light images. A division of the dependences of the parameters of the HeI λ10830 and HeII λ304 lines on the sunspot area into two branches can be distinguished for leading and trailing sunspots. Possible origins of this behavior of the line parameters are discussed.

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