Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh24a..03g&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH24A-03
Other
7513 Coronal Mass Ejections (2101), 7534 Radio Emissions
Scientific paper
Active region 720 was one of the super active regions of cycle 23 in that it produced large numbers of coronal mass ejections (CMEs) and major flares. The average recurrence time between flares in the region was about 2.5 h, but several flares and CMEs occurred with much shorter recurrence time. In this paper, we are concerned with two ultra-fast CMEs (speed > 2000 km/s) originating within 45 minutes. The CMEs merged with each other within the field of view of SOHO coronagraphs. Both CMEs were associated with long wavelength type II radio bursts. The type II burst associated with the first CME was normal, while that associated with the second CME showed irregular spectral behavior, including a characteristic broadband enhancement. Solar energetic particles (SEPs) associated with the two CMEs also showed some peculiarities, which are consistent with the interaction between the two CMEs. The SEP intensity reached a very high value around the time of interaction. We present radio and white light observations of the CMEs and provide an interpretation of the observed spectral features in the radio dynamic spectrum. Work supported by NASA's LWS TR&T and SR&T programs.
Akiyama Sanae
Gopalswamy Nat
Yashiro Seiji
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