Abstract
We have found several occurrences of slowly expanding giant arches in Yohkoh images. These are similar to the giant post-flare arches previously discovered by SMM instruments in the 80s. However, we see them now with 3–5 times better spatial resolution and can recognize well their loop-like structure. As a rule, these arches follow eruptive flares with gradual soft X-ray bursts and rise with speeds in the range of 1.1–2.4 km s−1 which keep constant for > 5 to 24 hours, reaching altitudes up to 250,000 km above the solar limb. These arches differ from post-flare loop systems by their (much higher) altitudes, (much longer) lifetimes, and (constant) speed of growth. One event appears to be a rise of a transequatorial interconnectiong loop.
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© 1996 Kluwer Academic Publishers
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Švestka, Z., FáRNíK, F., Hudson, H.S., Uchida, Y., Hick, P., Lemen, J.R. (1996). Large-Scale Active Coronal Phenomena in Yohkoh SXT Images. In: Uchida, Y., Kosugi, T., Hudson, H.S. (eds) Magnetodynamic Phenomena in the Solar Atmosphere. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0315-9_163
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DOI: https://doi.org/10.1007/978-94-009-0315-9_163
Publisher Name: Springer, Dordrecht
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