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- W2050745542 abstract "In this paper we analyse the non-potential magnetic field and the relationship with current (helicity) in the active region NOAA 9077 in 2000 July, using photospheric vector magnetograms obtained at different solar observatories and also coronal extreme-ultraviolet 171-Å images from the TRACE satellite. We note that the shear and squeeze of magnetic field are two important indices for some flare-producing regions and can be confirmed by a sequence of photospheric vector magnetograms and EUV 171-Å features in the solar active region NOAA 9077. Evidence on the release of magnetic field near the photospheric magnetic neutral line is provided by the change of magnetic shear, electric current and current helicity in the lower solar atmosphere. It is found that the ‘Bastille Day’ 3B/5.7X flare on 2000 July 14 was triggered by the interaction of the different magnetic loop systems, which is relevant to the ejection of helical magnetic field from the lower solar atmosphere. The eruption of the large-scale coronal magnetic field occurs later than the decay of the highly sheared photospheric magnetic field and also current in the active region." @default.
- W2050745542 created "2016-06-24" @default.
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- W2050745542 date "2002-05-01" @default.
- W2050745542 modified "2023-09-24" @default.
- W2050745542 title "Magnetic field, helicity and the 2000 July 14 flare in solar active region 9077" @default.
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- W2050745542 doi "https://doi.org/10.1046/j.1365-8711.2002.05345.x" @default.
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