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Super-active regions in solar cycle 24

Published online by Cambridge University Press:  09 September 2016

Anqin Chen  and
Jingxiu Wang
Anqin Chen
Affiliation:
Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081, PR China email: chenanqin@cma.gov.cn Key Laboratory of Solar Activity of Chinese Academy of Sciences, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China email: wangjx@nao.cas.cn
Jingxiu Wang
Affiliation:
Key Laboratory of Solar Activity of Chinese Academy of Sciences, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China email: wangjx@nao.cas.cn
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Abstract

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Comparing with solar cycles 21-23, the level of solar activity in the current cycle is very low. So far, there have been only five SARs and 45 X class flares. The monthly smoothed total solar irradiance decreased sharply by 0.09% from the maximum of cycle 23 to the minima between cycles 23 and 24. In this contribution, we present new studies on SARs in Cycle 24. The SARs in the current cycle have relatively smaller flare index (Iflare) and composite vector field index (Icom) comparing with the SARs in cycles 22 and 23. There is a clearly linear relationship between Iflare and Icom. The emphasis of this contribution is put on the similarity and different behaviors of vector magnetic fields of the SARs in the current solar cycle and the previous ones. We try to get a satisfactory account for the general characteristics and relatively lower level of solar flare activity in Cycle 24.

Keywords

Sun: activitySun: magnetic fieldSun: active regions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 309 - 314
Copyright
Copyright © International Astronomical Union 2016 

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