Differences between Central and Peripheral Umbral Dots

Details Differences between Central and Peripheral Umbral Dots Differences between Central and Peripheral Umbral Dots

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.23s&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

A time series of full-Stokes spectropolarimetric observations of the sunspot NOAA 10944, acquired with Hinode SOT/SP in February 2007, is analysed. The data were inverted using the code SIR into a series of 33 maps covering 3 hours of the umbra and penumbra evolution. Each map describes the spatial distribution of temperature, line-of-sight velocity, and magnetic field vector in two different ranges of optical depths corresponding to lower and upper photosphere. In these maps, several long-lived central (CUDs) and moving peripheral (PUDs) umbral dots were selected and their evolution was traced. While CUDs show only a very weak signature of LOS velocity and magnetic field inclination, in the low layers of PUDs were detected upflows of 500 m/s and an enhanced field inclination with respect to the surrounding umbra. These parameters decrease gradually during the evolution of PUDs. Hence, concerning the physical characteristics, PUDs resemble rather penumbral grains (from which they often originate) than CUDs.

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