Weak IR Lines Reveal Rapid Outflow in Cool Magnetic Penumbra

Details Weak IR Lines Reveal Rapid Outflow in Cool Magnetic Penumbra Weak IR Lines Reveal Rapid Outflow in Cool Magnetic Penumbra

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1106p&link_type=abstract

American Astronomical Society, SPD meeting #34, #11.06; Bulletin of the American Astronomical Society, Vol. 35, p.827

Astronomy and Astrophysics

Astronomy

Scientific paper

New imaging spectropolarimetric observations of the Evershed flow in sunspot penumbrae using weak infrared molecular absorption lines are presented. A plane-polar coordinate system in the sunspot frame is defined, allowing averaging of many raw spectra. Molecular lines show Doppler shifts implying typical horizontal outflow speeds of 6 to 9 km/sec. The Ti I polarimetric spectra show the same rapid outflow and suggest an average penumbral magnetic field strength of 1400 Gauss. While these observations show Doppler shifts of the entire line profile the velocities are in better agreement with previous measurements from spectral line asymmetries.

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