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Particle Acceleration in Magnetic Reconnecting Current Sheets

Author: LiYan
Tutor: LinZuo
School: Graduate School , Chinese Academy of Sciences (Yunnan Observatory )
Course: Astrophysics
Keywords: Sun: magnetic reconnection Particle acceleration
CLC: P353
Type: Master's thesis
Year: 2008
Downloads: 63
Quote: 0
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Abstract


The sun is a huge high-energy particle accelerators can produce up to tens of GeV ion and tens of MeV electrons . The flare is a violent release of energy in the solar atmosphere , up to 10 32 -10 33 < / sup > erg of energy in 10 2 -10 3 wherein s time release ,10-100keV electron and ion greater than 1MeV contains 10% -50 % of the energy , this means that the acceleration and energy release process is closely related . Accelerated electrons , protons through and the atmosphere surrounding the collision of hard x -rays and gamma rays . The hard X-ray flare energy release processes and particle acceleration mechanisms of the most important information is provided to us . Therefore , the particles accelerated to become one of the solar flares, the most attractive aspect . This article is divided into the following sections: introduction flare observations and their energy release process . The second chapter , the analysis of several different acceleration mechanisms . Chapter III , using the test particle method to study the characteristics of magnetic reconnection in the current sheet in the presence of a guide magnetic field Bz , electrons are accelerated super-Dreicer electric field Ez movement . The guidance magnetic field in the current sheet that is constant , but having a different orientation , in which case directly changes the electron trajectory , making it along a different path to leave the current sheet . Bz and Ez same direction , the higher energy electron pitch-angle close to 180 °. In contrast, when Bz and Ez reverse energetic electron pitch-angle close to 0 °. Guide the orientation of the magnetic field is just the electric field selectively on different areas of the electronic acceleration , but it will not affect the final electron energy distribution . The particle spectrum is a universal power law spectrum E - γ γ the size scale of the guide magnetic field depends on the size of the current sheet and the strength of the electric field of magnetic reconnection .

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CLC: > Astronomy,Earth Sciences > Geophysics > Space Physics > Outer Space, the Sun-Earth relationship of physical
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