On the triggering of M-class solar flare due to loop-loop interaction in AR NOAA 10875

Pankaj Kumar1, Abhishek K. Srivastava2, B.V. Somov3, P. K. Manoharan4, R. Erdélyi5 and Wahab Uddin2
1Korea Astronomy and Space Science Institute (KASI), Daejeon, 305-348, Korea
2Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263129, India
3Astronomical Institute, Moscow State University, Universitetskij Prospekt 13, Moscow 119992, Russia
4Radio Astronomy Centre, NCRA, Tata Institute of Fundamental Research, Udhagamandalam (Ooty) 643 001, India
5Solar Physics and Space Plasma Research Centre (SP2 RC), School of Mathematics & Statistics, The University of Sheeld, Sheeld S3 7RH, UK

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We present multiwavelength analysis of an M7.9 /1N solar flare which occurred on 27 April 2006 in AR NOAA 10875. The flare was triggered due to the interaction of two loop systems. GOES soft X-ray and TRACE 195 Å image sequences show the observational evidences of 3-D X-type loop-loop interaction with converging motion at the interaction site. We found the following characteristics during the loop-loop interaction: (i) a short duration/impulsive flare obeying the Neupart e ect, (ii) double peak structure in radio flux profiles (in 4.9 and 8.8 GHz), (iii) quasi-periodic oscillations in the radio flux profiles for the duration of ∼3 min, (iv) absence of CME and type III radio burst. The above characteristics observed during the flare are in agreement with the theory and simulation of current loop coalescence by Sakai et al. (1986). These are unique multiwavelength observations, which provide the evidences of loop-loop interaction and associated triggering of solar flare without CME.

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Keywords : Sun: ares – Sun: X-rays – Sun: CMEs