Homologous large-scale activity in solar eruptive events of 24-26 November 2000

Details Homologous large-scale activity in solar eruptive events of 24-26 November 2000 Homologous large-scale activity in solar eruptive events of 24-26 November 2000

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10902112c&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A2, CiteID A02112

Astronomy and Astrophysics

Astrophysics

17

Solar Physics, Astrophysics, And Astronomy: Corona, Solar Physics, Astrophysics, And Astronomy: Flares, Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Solar And Stellar Variability

Scientific paper

We study large-scale activity on the solar disk associated with a 24-26 November 2000 series of six recurrent major flares and ``halo'' coronal mass ejections (CMEs). The analysis is based mainly on the SOHO/EIT data, particularly by using properly rotated difference full-disk images with 12-min intervals at 195 Å as well as with 6-hour intervals at 171, 195, 284, and 304 Å. We demonstrate that these eruptive events were homologous not only by their flare and CME characteristics, as Nitta and Hudson [2001] showed, but also in terms of their large-scale CME-associated manifestations in the EUV corona. These include long and narrow channeled dimmings, some transequatorial; anisotropic coronal waves, propagating in a restricted angular sector; and additional quasi-stationary emitting fronts. As a whole, in all of these six events, the homologous CME-associated disturbances covered a considerable portion of the solar disk. The homology tendency appears to be due to significant disturbance, partial eruption, and relatively fast restoration of the same large-scale structures involved in the repeating CME events. We briefly discuss the implications of the analysis in connection with the nature of coronal equilibrium.

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