Study of Sunspot’s Proper Motion During X1.0 Solar Flare on 28th October 2021
摘要
Many studies have been conducted on active region 12887 (AR12887), which caused the X1.0-class solar flare event on October 28, 2021, especially on the correlation of the solar flare with other solar activities such as magnetic evolution of the aforementioned region. In this work, we aim to further investigate the relationship between the motion of the sunspots and the solar flare. For that, we carried out an analysis regarding the proper motion of sunspots in AR12887 for all of its observable duration, in which the measurement was conducted using the Carrington heliographic coordinate system using JHelioviewer, based on Solar Dynamic Observatory (SDO) observation images. We measured a total of 7 days, starting from October 25th to October 31st, 2021, with a 1-h interval, totaling 166 images and 37 sunspots. The number of sunspots increased before the solar flare due to activities such as the emergence and fragmentation of sunspots, then decreased after the flare as there were no more new sunspots emerging. Sunspots’ movements were far more erratic before the flare because of the high magnetic activity, especially shearing, and gradually slowed down after the flare. The flare itself did not significantly affect the movement direction of the spots inside its region, while sunspots located at the periphery of the flare have the tendency to move away from it.