Abstract
Observations of a 3B, M6 flare on April 2, 1991 appear to confirm earlier evidence that eruptive flares are triggered by measurable magnetic field changes. In the eight hours before the flare, the shear in the magnetic fields increased. The development that likely triggered the flare was the emergence into the active region and rapid proper motion of new flux. One of the small spots marking the negative magnetic leg of the new flux pushed into an established positive field at 0.2 km/s. Data from the JHU/APL vector magnetograph show that this motion led to the development of a sheared field. The flare started near the newly-sheared fields and spread to engulf most of the spot region. A magnetogram taken 45 min after flare onset shows possible relaxation of the sheared fields.
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© 1992 Springer-Verlag
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Rust, D.M., Cauzzi, G. (1992). Variation of the vector magnetic field in an eruptive flare. In: Švestka, Z., Jackson, B.V., Machado, M.E. (eds) Eruptive Solar Flares. Lecture Notes in Physics, vol 399. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-55246-4_73
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DOI: https://doi.org/10.1007/3-540-55246-4_73
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