Shifts of the CA II K line in He I 10830 dark points

Details Shifts of the CA II K line in He I 10830 dark points Shifts of the CA II K line in He I 10830 dark points

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..107...63h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 107, no. 1, 1987, p. 63-72. Research supported by Swarthmore College.

Physics

7

Chromosphere, Doppler Effect, Solar Flux Density, Solar Spectra, Solar Velocity, Calcium, Coronal Holes, Helium, Potassium, Solar Wind

Scientific paper

The velocity field of the solar chromosphere at the location of 65 He I 10830 dark points (DPs) is investigated. Spectra of such points were obtained in the vicinity of the Ca II K line. As a measure of differential chromospheric velocity, the shift of the K line center relative to a nearby photospheric Fe I line is used. It is found that in He I DP's, the distribution of K line shifts is skewed towards the blue: the blueward skewing is more pronounced in He I DP's located in coronal holes. To the extent that He I DP's are proxies of coronal bright points, the study is relevant to previous reports of outflows from such bright points.

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