The Moat Flow in Two Different Heights

Details The Moat Flow in Two Different Heights The Moat Flow in Two Different Heights

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.26b&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

We investigate time series obtained with the Transition Region And Coronal Explorer (TRACE) simultaneously in two wavelength ranges, in whitelight (WL) and in the ultraviolet at 170 nm (UV). In the quiet sun, the UV is most sensitive to layers just below the temperature minimum. The field-of-view was centered on a small sunspot passing the central meridian. Horizontal velocities are determined by local correlation techniques (LCT), and we compare two different LCT-methods. We find an extended outflow in the moat. We detect the outflow up to four times the radius of the spot. For both wavelength ranges the outer boundary of the flow is located at the same distance from the center of the spot. In the inner moat velocities are higher in the UV, indicating higher velocities in the upper layers. In the outer moat higher velocities are detected in WL.

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