Parameters of Coronal Dimmings and Their Variations during Solar Cycle 24статья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.
Аннотация:Abstract—The parameters of dimmings and their relation to coronal mass ejections (CMEs) are studied todetermine the location of possible sources of ejections on the solar disk during solar cycle 24. We used theSolar Demon database, which contains information on flares and dimmings obtained by processing imagesfrom the SDO/AIA space observatory. Of all the analyzed dimmings, 16% are аssociated with CMEs fromthe CACTus database using SOHO/LASCO coronagraph data for 2010–2018. Based on the parameter distribution,it is found that dimmings related with CMEs are on average events with large absolute parameter values.The correlation coefficient between the position angle of the dimmings and the position angle of the CMEassociated with them is 0.96. For dimmings observed in the central part of the solar disk, we obtained correlationcoefficients between the CME velocity and dimming parameters that are close to 0.5. The results can be used tomodel the propagation of CMEs and to refine the probability of their arrival to the near-Earth orbit.