Open AccessCME acceleration in impulsive (X6.9 09.08.2011) and gradual (M3.7 07.03.2011) solar flares
Author(s) -
A. Struminsky,
A. Sadovski,
I. Yu. Grigorieva
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.132
Subject(s) - acceleration , physics , coronal mass ejection , astrophysics , solar flare , magnitude (astronomy) , solar wind , nuclear physics , plasma , classical mechanics
We analyze solar events associated with ares: gradual — M3.7 on March 7, 2011 and impulsive — X6.9 on August 9, 2011.These ares were accompanied by hard X-ray (HXR), microwave (MW) and > 100 MeV gamma radiation, fast coronalmass ejection (CME). Estimates of the magnitude and duration of acceleration for CME were obtained from the conditionof stitching the assumed uniformly accelerated motion and the observed uniform motion. These estimates indicate that theCME should have been accelerated signicantly longer than the estimated minimum time, at least more than 30 min. Theobtained mean values and duration of CME acceleration do not contradict CME acceleration in two phases— impulsive andprolong. The largest bursts of HXR and MW radiation were observed both during the CME impulsive acceleration (X6.9are on August 9, 2011), and after it (M3.7 are on March 7, 2011). This shows that the acceleration processes of chargedparticles in ares do not depend on the magnitude of the CME acceleration. The average CME velocity deduced from theSOHO/LASCO observations at 20R ⊙ in the high corona 2034 km/s on March 7, 2011 and 1506 km/s on August 9, 2011suggests that a residual decelerating force acting on CME on August 9, 2011 was larger.