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Quasi-periodic processes in the flare loop generated by sudden temperature enhancements at loop footpoints
- 1.0463105 - ASÚ 2017 RIV FR eng J - Journal Article
Karlický, Marian - Jelínek, Petr
Quasi-periodic processes in the flare loop generated by sudden temperature enhancements at loop footpoints.
Astronomy & Astrophysics. Roč. 590, June (2016), A4/1-A4/9. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR GAP209/12/0103; GA ČR(CZ) GA16-13277S
Grant - others:EC(XE) 295272; EC(XE) 606862
Program: FP7-PEOPLE; FP7
Institutional support: RVO:67985815
Keywords : Sun flares * oscillations * magnetohydrodynamics
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.014, year: 2016
During the impulsive flare phase, the plasma at the flare loop footpoints is rapidly heated by particle beams. In the present paper, we study processes that occur after this sudden heating in a two-dimensional magnetic loop. We consider a model of the solar atmosphere with a symmetric magnetic loop. The length of this loop in the corona is approximately 21 : 5 Mm. At both loop footpoints, at the transition region, we initiate the Gaussian temperature (pressure) perturbation with the maximum temperature 14, 7, or 3.5 times higher than the unperturbed temperature. In the corona, the perturbations produce supersonic blast shocks with the Mach number of about 1.1, but well below Alfven velocities. We consider cases with the same perturbations at both footpoints (symmetric case) and one with different perturbations (asymmetric case). In the symmetric case, the shocks move along both loop legs upwards to the top of the loop, where they interact and form a transient compressed region.
Permanent Link: http://hdl.handle.net/11104/0262387
Number of the records: 1