Transient induced MHD oscillations: a tool to probethe solar active regions

Abhishek K. Srivastava1*, V. M. Nakariakov2,5, B. N. Dwivedi3 and Pankaj Kumar4
1Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 129, India
2Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL, UK
3Department of Applied Physics, Institute of Technology, Banaras Hindu University, Varanasi 221005, India
4Korea Astronomy and Space Science Institute (KASI),Hwaamdong, Yuseong-Gu, Daejeon-305-348, Republic of Korea
5Central Astronomical Observatory at Pulkovo of the Russian Academy of Sciences, 196140, St Petersburg, Russia

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Solar transients and eruptive phenomena which are ubiquitous in the solar atmosphere, can shed new light to the understanding of the outstanding problems like coronal heating and the solar wind acceleration. Observations in the entire electromagnetic spectrum of such dynamical processes of large and small-scale transient/eruptive events, with highly dynamic magnetic field configuration, and energetic particles, provide crucial information about the plasma processes at mega-Kelvin temperature embedded in a complex magnetic field, and also energy buildup/energy-release processes, taking place in such events. One of the most important phenomenological aspects of solar eruptive phenomena is the induced magnetohydrodynamic (MHD) waves generated during these energetic processes, which carry a potential signature to probing the solar active regions. In this paper, we briefly review the recent trends of the transient (e.g., flares) induced quasi-periodic oscillations in the solar atmosphere and discuss their implications in diagnosing the solar active regions, providing the clue to understanding local plasma dynamics and heating.

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Keywords : Sun: corona – Sun: oscillations – Sun: flares