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Abnormal rotation rates of sunspots and durations of associated flares

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dc.contributor.author Suryanarayana, G. S
dc.contributor.author Hiremath, K. M
dc.contributor.author Bagare, S. P
dc.contributor.author Hegde, M
dc.date.accessioned 2020-11-14T07:06:51Z
dc.date.available 2020-11-14T07:06:51Z
dc.date.issued 2015-08
dc.identifier.citation Astronomy & Astrophysics, Vol. 580, A25 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6999
dc.description Open Access © ESO http://dx.doi.org/10.1051/0004-6361/201423389 en_US
dc.description.abstract Context. Short-duration and long-duration flares are important in terms of their association with coronal heating and coronal mass ejections, respectively. Sunspot motions in the photosphere have been known to be associated with flare occurrences. Aims. We study the association between the abnormal rotation rates (longitudinal displacement in a given latitude in contrast with the rotation of spots around their umbral centre) of sunspots and flare duration. Methods. We compute the rotation rates of sunspots for different days during their evolution. We consider rotation rates that are in excess of one standard deviation as abnormal rotation rates. Also, the duration of time between the initial and final stages of the flares are computed. Results. Using Kodaikanal Observatory white light picture and GOES soft X-ray flare data, we find that a good association with a high significance exists between abnormal rotation rates of sunspots and flare durations. In contrast, we find that duration of flare is independent of sunspot area. Conclusions. The present study suggests that sub-surface dynamics plays a dominant role in determining the duration and rate of dissipation of energy during flares en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Sunspots en_US
dc.subject Sun: rotation en_US
dc.subject Sun: flares en_US
dc.title Abnormal rotation rates of sunspots and durations of associated flares en_US
dc.type Article en_US


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