Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009acasn..50..271l&link_type=abstract
Acta Astronomica Sinica, vol. 50, no. 3, p. 271-288
Astronomy and Astrophysics
Astronomy
Sun: Flares, Sun: Coronal Mass Ejections (Cmes), Sun: Magnetic Fields, Acceleration Of Particles
Scientific paper
The kinematic characteristic of electrons after acceleration by a super-Dreicer electric field Ez is investigated in the reconnecting current sheet (RCS) with a guiding magnetic field Bz by simulations of testing particles. Firstly, the influence of the different directions of the electric filed on the acceleration of particles, changing the trajectories of electrons, is discussed when assuming the magnetic field as a constant. If Bz parallels to Ez, the pitch-angle of accelerated electrons is close to 180 degree; If Bz anti-parallels to Ez, the pitch-angle is close to 0 degree. The different directions of the guiding magnetic field lead to different regions where electrons are accelerated by the electric field but will not change the final energy distribution of electrons-in form of a power-law distribution E-gamma;. Γ approximates to 2.9 in typical coronal conditions. Further research indicates that γ depends on the strength of both the guiding field and electric field and the scale of the current sheet. Secondly, the kinematic characteristic of accelerated particles in the current sheet including multiple X- and O-points is further investigated. Particles in the RCS with X- and O- points are trapped and get the maximal acceleration in the accelerating region. The final energy spectrum shows a multiple power-law distribution.
Li Yadong
Lin Juhn-Jong
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