The Pattern of Moving Magnetic Inhomogeneities in and Around Sunspots
Venkatakrishnan, P.; Kumar, Brajesh; Ravindra, B.
India
Abstract
High-resolution MDI magnetograms are used to study the pattern of moving magnetic inhomogeneities in sunspots. We examine the inward and outward moving features in sunspots. The velocity of these features is small in the umbra while it is about 0.5 km s−1 in the outer penumbra. The inward and outward moving features may be the possible origin for the long-term fluctuations of magnetic field strength in sunspots.