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Variation of the solar magnetic flux spectrum during solar cycle 23 View all abstracts by submitter

Chunlan Jin   Submitted: 2013-12-19 23:04

By using the unique database of SOHO/MDI full disk magnetograms from 1996 September to 2011 January, covering the entire solar cycle 23, we analyze the time-variability of the solar magnetic flux spectrum and study the properties of extended minimum of cycle 23. We totally identify 11.5 million magnetic structures. It has been revealed that magnetic features with different magnetic fluxes exhibit different cycle behaviors. The magnetic features with flux larger than 4.0 imes 1019 Mx, which cover solar active regions and strong network features, show exactly the same variation as sunspots; However, the remaining 82% magnetic features which cover the majority of network elements show anti-phase variation with sunspots. We select a criterion that the monthly sunspot number is less than 20 to represent the Sun's low activity status. Then we find the extended minimum of cycle 23 is characterized by the long duration of low activity status, but the magnitude of magnetic flux in this period is not lower than previous cycle. Both the duration of low activity status and the minimum activity level defined by minimum sunspot number show a century period approximately. The extended minimum of cycle 23 shows similarities with solar cycle 11, which preceded the mini-maxima in later solar cycles. This similarity is suggestive that the solar cycles following cycle 23 are likely to have low activity.

Authors: Chunlan Jin & Jingxiu Wang
Projects: None

Publication Status: accepted by JGR
Last Modified: 2013-12-20 14:56
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