Velocity and Magnetic Structure of Sunspot Umbral Dots

Details Velocity and Magnetic Structure of Sunspot Umbral Dots Velocity and Magnetic Structure of Sunspot Umbral Dots

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640111p&link_type=abstract

American Astronomical Society, AAS Meeting #216, #401.11; Bulletin of the American Astronomical Society, Vol. 41, p.858

Astronomy and Astrophysics

Astronomy

Scientific paper

The Doppler velocity measurements of umbral dots obtained with Spectropolarimeter (SP) on board Hinode Solar Optical Telescope is used to study the sunspot structure. The SP observations, each more than an hour long, were carried out at 2-minute cadence with 25 slit positions at penumbral boundary of a sunspot on 2-3 February 2007. These observations record the formation and decay of at least four umbral dots. The Doppler velocity observed in and around the umbral dots using Stokes profiles show unidirectional velocities of about 700 to 1200 meters per second. The Stokes-V profiles at these locations show asymmetry of about 1 to 5 % compared to the surroundings. We discuss the formation mechanisms of umbral dots and their implication for sunspot structure using these observations.
This work is supported by NASA grant NNX08AQ32G and NSF grant ATM 05-48260.

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