Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh51c..05b&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH51C-05
Other
7513 Coronal Mass Ejections
Scientific paper
The multispectral observations of NOAA active region No. 8038 during 10-13 May 1997 are presented. The observations of MDI/SOHO magnetograms show that in this active region continual but discrete growth and decay of magnetic field was taking place indicating either continuous evolution of magnetic flux or emergence of new flux region. The movie of these magnetograms reveal two important results that the major opposite polarities of pre-existing region were approaching towards each other, and a small north polarity flux i.e. moving magnetic feature (MMF) was ejecting out from major north polarity at a quasi-periodicity of about 10 hrs during 10-13 May 1997. It appears that as a result of flux cancellation by one such ejected north polarity flux with a newly emerged south polarity flux around 04:30 UT on 12 May 1997, a blast wave generated, seen by EIT/SOHO, producing CME and a moderate but long enduring 1B/C1.3 solar flare. The observations in Hα, soft X-ray, hard X-ray, ionospheric absorption, radio and interplanetary scintillations in association to this flare are presented in detail.. The multiwavelength observations of the flare showed occurrence of at least two phases of energy release, first at 04:42 and second at 04:47 UT. We propose a qualitative model to interpret the observations, which, however, also explains the generation of CME and associated flare with two stages of energy release. The occurrence of type II radio burst at 04:54 UT was perhaps due to shock produced by the plasmoid erupted during second energy release at higher altitude in the corona. It appears that the plasmoid traversed through shock in the interplanetary medium so as to enhance the scintillation index on 14 May as inferred from IPS observations.
Bharti Lokesh
Jaaffrey S. N.
Jain Rahul
Joshi Chaitanya
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