Proper motion measurements of umbral and penumbral structure

Details Proper motion measurements of umbral and penumbral structure Proper motion measurements of umbral and penumbral structure

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..154...29m&link_type=abstract

Solar Physics, vol. 154, no. 1, p. 29-39

Physics

Optics

18

Magnetic Field Configurations, Magnetic Flux, Mass Flow, Penumbras, Photosphere, Solar Atmosphere, Solar Magnetic Field, Sunspots, Umbras, Atmospheric Optics, Doppler Effect, Filtergrams, Gauss Equation, Least Squares Method, Mathematical Models, Radiant Flux Density, Spectroscopy, Telescopes, Time Series Analysis

Scientific paper

Horizontal proper motions of penumbral structure and umbral dots have been measured from a 17-min-long time series of sunspot images by numerical techniques. In the penumbra, inflows are seen to occur predominantly in the inner region, with an average velocity of 290 m/s. Penumbral outflows take place mostly in the outer part, where they reach velocities as high as 1.5 km/s, with an average velocity of 500 m/s. In the umbra, proper motions of 28 bright dots have been measured with an accuracy better than 50 m/s. The mean velocity of the umbral dots is 210 m/s. Most of the umbral dots display the well-known inward motion away from the peripheral umbra.

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