Circular polarization of the CA II H and K lines in solar quiet and active regions

Details Circular polarization of the CA II H and K lines in solar quiet and active regions Circular polarization of the CA II H and K lines in solar quiet and active regions

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361l..81m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. L81-L85. Research supported by CICYT.

Astronomy and Astrophysics

Astrophysics

11

Calcium, Circular Polarization, H Lines, K Lines, Solar Activity, Solar Spectra, Emission Spectra, Line Spectra, Solar Flares, Solar Magnetic Field, Sunspots

Scientific paper

A representative set of profiles is presented for the Ca II H resonace line in Stokes V and I, for the quiet sun, plages, sunspot umbrae, and a flare, as well as one example of the Ca II K line in a sunspot penumbra. The degree of polarization is highest in the spots and zero in the quiet sun, within error limits. The V profile asymmetries are, however, highest in the flare. The spectra of the Ca II K line are used to obtain a linear relation between V(lambda) and -dI/d(lambda) and a value for B(parallel) of 820 + or - 40 G using the weak-field approximation.

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