Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..173k&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
Physics
Scientific paper
During this long-lasting X2.3 flare (15:00-17:00 UT) two 3 GHz maxima (impulsive phases) were recognized at 15:06:46-15:07:00 and 16:26:34-16:26:42 UT. Quasi-periodic oscillations with the periods of 160 s and 11 s, respectively, were found, during both these impulsive phases. While in the first impulsive phase the 2.0-4.5 GHz broadband pulsations superimposed on the continuum were recorded, during the second one several quasi-periodic patches of narrowband spikes were observed in the frequency range of 2.5-3.5 GHz. Moreover, at the onsets of both impulsive phases the narrowband fast drift structures slowly drifting towards lower frequencies and indicating the plasmoid ejection were recorded. The SOHO and YOHKOH images of the flare show parallel loops with brightenings among them. It shows that the flaring loops interact. This view is supported by simultaneous observations of the quasi-periodic oscillations at 3 GHz and the narrowband pulsations in the second impulsive phase, which can be thus understood in the framework of the current loop coalescence model.
Cecatto José R.
Farnik Frantisek
Fernandes Francisco Carlos Rocha
Karlicky Marian
Mészárosová Hana
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