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- W3150794953 abstract "Recent study using Huairou vector magnetograph data shows that dur ing flare activity, the current helicity exhibits rapid and substantial variations and,in some cases, a recovering phase. We considered various representative the mag netic confgurations. First, interacting twisted magnetic flux tubes are analyzed separately for positive, negative and mixed-sign helicity regions. The results show that the helicity during flares decreases in positive-sign, and increases in negative sign regions. Then, flaring arcade also shows that the magnitude of the helicity decreases after flares. We also investigated current sheets formed by sheared mag netic field and showed that the current helicity (with either positive and negative signs) vanishes after reconnection. The emergence of twisted flux tubes which can trigger flares may be another source of flare-associated variability of current helicity.We demorstrate the relevance of current helicity to the description of flare activity by compming its variation with that of shear angle in the active region AR 6891." @default.
- W3150794953 created "2021-04-13" @default.
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- W3150794953 date "2002-01-01" @default.
- W3150794953 modified "2023-10-16" @default.
- W3150794953 title "Solar Flare Activity and Variability of Electric Current Helicity" @default.
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