The Extreme Downflow in the Umbral Light Bridge of the sunspot

Abstract

Sunspots are the most readily visible manifestations of the interaction of the solar magnetic field with the solar atmosphere and the most prominent tracers of solar magnetic activity. Results of the recent studies based on observation from Hinoddetectedthe presence of extremedownflows in a sunspot light bridgeup to 7.2 kms^-1 which is exceed the speed of sound in solar photosphere of about 6 kms^-1. The convective downflows and upflows are associated with a strong horizontal outflow directed radially outwards from the sunspot centre. These horizontal flows constitute the famous and mysterious Evershed effect. In the present paperwe studied the asymmetries and wavelength shifts of the FeI lines at 630.25 nm to detect the exiting of the extreme downflows in the sunspot light bridge. Our analysis reveals the presence of extreme downflows in the umbra light bridge of the sunspot of more than 10 km s^-1.