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Based on Y ohkoh/SXT, SOHO/EIT images and movies, as well as on Ha, He I 10830 heliograms A and other relevant data, we analyze an event of 1999 December 28, which is interesting in at least two aspects. (1) A major horseshoe-shaped Ha Ðlament appeared to be located within a large transequatorial coronal hole (CH) in the eastern hemisphere. (2) This Ðlament subsequently disappeared, with its eruption combined with a number of dynamic phenomena, including large-scale ones. The probable location of the Ðlament inside the CH was conÐrmed in detail by calculations of the open Ðeld regions and, for the Ðrst time, the quasi-separatrix layers in the global solar magnetic Ðeld. The Ðlament eruption was accompanied by signiÐcant evolution of the soft X-ray and EUV-emitting structures inside the CH as well as by a coronal mass ejection. The analysis indicates that CHs need not have the simple and uniform structure normally assumed and can sometimes contain local areas with low-altitude closed magnetic Ðelds. It demonstrates also that the erupting Ðlament inside the CH was a part of a much more global, evolving magnetic structure associated with activity extending through at least the entire eastern half of the disk.
Based on Y ohkoh/SXT, SOHO/EIT images and movies, as well as on Ha, He I 10830 heliograms A and other relevant data, we analyze an event of 1999 December 28, which is interesting in at least two aspects. (1) A major horseshoe-shaped Ha Ðlament appeared to be located within a large transequatorial coronal hole (CH) in the eastern hemisphere. (2) This Ðlament subsequently disappeared, with its eruption combined with a number of dynamic phenomena, including large-scale ones. The probable location of the Ðlament inside the CH was conÐrmed in detail by calculations of the open Ðeld regions and, for the Ðrst time, the quasi-separatrix layers in the global solar magnetic Ðeld. The Ðlament eruption was accompanied by signiÐcant evolution of the soft X-ray and EUV-emitting structures inside the CH as well as by a coronal mass ejection. The analysis indicates that CHs need not have the simple and uniform structure normally assumed and can sometimes contain local areas with low-altitude closed magnetic Ðelds. It demonstrates also that the erupting Ðlament inside the CH was a part of a much more global, evolving magnetic structure associated with activity extending through at least the entire eastern half of the disk.
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