Quasi-periodic processes in the flare loop generated by sudden temperature enhancements at loop footpoints

0463105 - ASÚ 2017 RIV FR eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GAP209/12/0103; GA ČR(CZ) GA16-13277S
Grant ostatní: EC(XE) 295272; EC(XE) 606862
Program: FP7-PEOPLE; FP7
Institucionální podpora: RVO:67985815
Klíčová slova: Sun flares * oscillations * magnetohydrodynamics
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.014, rok: 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.

Trvalý link: http://hdl.handle.net/11104/0262387