Inference of 3-dimensional structure underlying large-scale coronal events observed by YOHKOH and ULYSSES

Astronomy and Astrophysics – Astronomy

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Solar Corona, Solar Observatories, X Rays, X Ray Imagery, Spaceborne Astronomy, Solar Flares, X Ray Astronomy, Ulysses Mission, Japanese Spacecraft, Stellar Mass Ejection, X Ray Spectra, Magnetic Field Configurations, Solar Rotation

Scientific paper

The Yohkoh/SXT images provide full-disk coverage of the solar corona, usually extending before and after one of the large-scale eruptive events that occur in the polar crown These produce large arcades of X-ray loops, often with a cusp-shaped coronal extension, and are known to be associated with coronal mass ejections. The Yohkoh prototype of such events occurred 12 Nov. 1991. This allows us to determine heights from the apparent rotation rates of these structures. In comparison v with magnetic-field extrapolations from Wilcox Solar Observatory. use use this tool to infer the three dimensional structure of the corona in particular cases: 24 Jan. 1992, 24 Feb. 1993, 14 Apr. 1994, and 13 Nov. 1994. The last event is a long-duration flare event.

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