The sunspot transition region - Where are the bright plumes and the downflows?

Details The sunspot transition region - Where are the bright plumes and the downflows? The sunspot transition region - Where are the bright plumes and the downflows?

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..865g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 2, p. 865-869.

Astronomy and Astrophysics

Astrophysics

19

Solar Atmosphere, Solar Maximum Mission, Solar Spectra, Sunspots, Umbras, Emission Spectra, Line Spectra

Scientific paper

Measurements of umbral-to-quiet sun and umbral-to-plage contrast in five active regions have been obtained in the transition region emission lines Si IV 1402.77 A, C IV 1548.19 A, and O V 1371.29 A, using the Ultraviolet Spectrometer and Polarimeter on the Solar Maximum Mission. The umbral transition region in these lines appears generally indistinguishable from the quiet transition region. In addition, high-resolution profiles of the C IV lines 1548.19 A, 1550.77 A in the umbrae of eight individual sunspots in different active regions show only weak, mostly subsonic, redshifted components. This result differs sharply from the observations of multiple, strong, often supersonic downflows observed with the HRTS instrument (e.g., Brekke et al., 1987).

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