The magnetic properties of solar surges |
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| Authors: | J René Roy |
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| Institution: | 1. Department of Astronomy, University of Western Ontario, London, Ontario, Canada
2. Sacramento Peak Observatory, Air Force Cambridge Research Laboratories, 88349, Sunspot, N.M., U.S.A.
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| Abstract: | High resolution on- and off-band Hα filtergrams of disk solar surges obtained with the Vacuum Tower Telescope of the Sacramento Peak Observatory have been compared to magnetic data. - Surges constitute clusters of very fine dark (sometimes bright) filaments where each thread connects to an Ellerman bomb brightening. If the magnetic map reveals the existence of a satellite polarity as defined by Rust (1968), the bomb(s) lies over it.
- Although a large fraction of surges is not associated with clearly detectable satellite polarities, events are strongly favored in regions of evolving magnetic features, characterized by dimensions of about 10 000 km and significant flux change over a period of less than a day. A flux change rate of 3 × 1015 Mx s?1 has been measured along at least three homologous bomb-surge events in a satellite of region MW 18594. Surges appear to be related to rising flux of one polarity into a region of stronger opposite flux.
- The trajectories of surges are matched by magnetic lines of force computed in the current-free approximation.
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