Can cool loop flows explain 'transition region' redshifts?

Details Can cool loop flows explain 'transition region' redshifts? Can cool loop flows explain 'transition region' redshifts?

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347l..47m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. L47-L50.

Astronomy and Astrophysics

Astrophysics

27

Coronal Loops, Magnetic Stars, Red Shift, Solar Activity, Solar Magnetic Field, Emission Spectra, Extreme Ultraviolet Radiation, Solar Atmosphere, Steady Flow, Temperature Distribution, Velocity Distribution

Scientific paper

Observations of solar active regions reveal extensive areas of redshifted emission lines in the extreme ultraviolet, indicative of down flowing plasma. Redshifts are seen also in the magnetic network of the quiet sun and in magnetically active stars. The inferred velocities are large and appear to represent steady flows. Redshifts are not observed at higher coronal temperatures. It is shown here that steady flow in 'cool' loops driven by the buoyancy force set up by a small heating asymmetry between the two legs of the loop, offers a possible theoretical explanation of the observed features.

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