X-ray observations of recurrence of eruptive flares and active regions

Details X-ray observations of recurrence of eruptive flares and active regions X-ray observations of recurrence of eruptive flares and active regions

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..184..149b&link_type=abstract

Solar Physics, v. 184, Issue 1, p. 149-152 (1999).

Physics

Scientific paper

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 10deg 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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