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- W3136201418 abstract "It is well known that flares cause changes in the azimuthal direction of chromospheric magnetic field lines (e.g. Zirin, 1983). It is less well known that flares also cause changes in the inclination angle of chromospheric magnetic field lines (Bruzek, 1975). Inclination angle changes are notable in that horizontal field lines take the form of fibrils, while vertical field lines take the form of plages (Marsh, 1976). This study examines a complete sample of large flares to determine when the field inclination changes during the flare. The Hard X-ray Burst Spectrometer Event Listing (Dennis et. al, 1985) was searched for events with total counts > 105 and start times > 14 UT but <24 UT. Big Bear Solar Observatory Hα films were examined to identify which X-ray events show large horizontal ribbon motion over regions of fibrils. Of the 7 events found, 6 contain areas of the chromosphere that have the magnetic field direction turned from horizontal to vertical. The change in field direction at a given location occurs after the arrival of the ribbon, often 103 to 104 s after the flare start. No change in the chromosphere is seen before the ribbon arrival." @default.
- W3136201418 created "2021-03-29" @default.
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- W3136201418 date "1987-06-01" @default.
- W3136201418 modified "2023-10-18" @default.
- W3136201418 title "Flare-Induced Magnetic Field Changes in the Chromosphere" @default.
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