Fine Structure in Sunspots: Sizes, Lifetimes, Motions and Temporal Variations

摘要

The analysis of a 4 1/2 hour series of high resolution white light observationsof the umbra in a sunspot NOAA 7519 is described. An object-tracking procedure was applied to the destretched movie of 360 frames. In total, 662 umbral dots were tracked and their intensity variations, effective diameters, lifetimes, and proper motions were measured.