Abstract
In a study of soft X-ray coronal images obtained with the Yohkoh spacecraft, two eruptive flares with remarkably similar X-ray structures were noted – most remarkably because the flares occurred at the same solar location (approximately 10 deg north latitude on the east limb) yet separated in time by three solar rotations. Between the times of the eruptions, the active region responsible for the first flare disappeared from Yohkoh images. An extremely similar X-ray active region replaced it by the third solar rotation. The recurring X-ray active region appearance and recurring flare activity after 86 days suggest that persistent subsurface flux emergence patterns might be responsible, and support previous arguments that ‘active longitudes’ exist.
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References
Allen, C. W.: 1976, Astrophysical Quantities, 3rd ed., Athlone Press, New York, p. 180.
Bai, T.: 1988, Astrophys. J. 328, 860.
Bieber, J. W., and Rust, D. M.: 1995, Astrophys. J. 453, 911.
Gough, D. O. and McIntyre, M. E.: 1998, Nature 394, 755.
Kiplinger, A. L., Dennis, B. R., and Orwig, L. E.: 1984, Bull. Amer. Astron. Soc. 16, 891.
Kosovichev, A. et al.: 1997, Solar Phys. 170, 43.
McIntosh, P. S.: 1981, in L. E. Cram and J. H. Thomas (eds.), The Physics of Sunspots, Sacramento Peak Observatory, Sunspot, p. 6.
Rust, D. M. and Kumar, A.: 1994, Solar Phys. 155, 69.
Rust, D. M. and Kumar, A.: 1996, Astrophys. J. 464, L199.
Švestka, Z.: 1976, Solar Flares, D. Reidel Publ. Co., Dordrecht, Holland.
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Batchelor, D. X-ray observations of recurrence of eruptive flares and active regions. Solar Physics 184, 149–152 (1999). https://doi.org/10.1023/A:1005084306791
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DOI: https://doi.org/10.1023/A:1005084306791