Letter to the Editor
Infrared lines as probes of solar magnetic features
XV. Evershed flow in cool, weak penumbral fields
Received 2 July 1999 / Accepted 14 July 1999
Observations of Ti lines at 2.2 µm show that the Evershed flow takes place in cool, almost horizontal channels with a low magnetic field strength ( G) that does not appear to change significantly across the penumbra. This property might allow an outward directed siphon flow to exist along such cool flux tubes.
Key words: Sun: activity Sun: infrared Sun: magnetic fields Sun: photosphere Sun: sunspots
Send offprint requests to: I. Rüedi
This article contains no SIMBAD objects.
© European Southern Observatory (ESO) 1999
Online publication: July 26, 1999