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PROTON ACCELERATION IN ANALYTIC RECONNECTING CURRENT SHEETS

机译:分析连接电流表中的质子加速

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Particle acceleration provides an important signature for the magnetic collapse that accompanies a solar flare. Most particle acceleration studies, however, invoke magnetic and electric field models that are analytically convenient rather than solutions of the governing magnetohydrodynamic equations. In this paper a self-consistent magnetic reconnection solution is employed to investigate proton orbits, energy gains, and acceleration timescales for proton acceleration in solar flares. The magnetic field configuration is derived from the analytic reconnection solution of Craig and Henton. For the physically realistic case in which magnetic pressure of the current sheet is limited at small resistivities, the model contains a single free parameter that specifies the shear of the velocity field. It is shown that in the absence of losses, the field produces particle acceleration spectra characteristic of magnetic X-points. Specifically, the energy distribution approximates a power law ~ε~(-3/2) nonrelativistically, but steepens slightly at the higher energies. Using realistic values of the "effective" resistivity, we obtain energies and acceleration times that fall within the range of observational data for proton acceleration in the solar corona.
机译:粒子加速为伴随太阳耀斑的磁坍塌提供了重要的标志。但是,大多数粒子加速度研究都调用了分析上方便的磁场和电场模型,而不是控制磁流体动力学方程的解。本文采用自洽磁重连接解决方​​案来研究质子轨道,能量增益以及太阳耀斑中质子加速的加速时标。磁场配置源自Craig和Henton的解析重连接解决方​​案。对于物理现实的情况,即当前薄板的磁压力被限制在较小的电阻率下,该模型包含一个自由参数,用于指定速度场的切变。结果表明,在没有损失的情况下,磁场会产生具有磁性X点特征的粒子加速光谱。具体而言,能量分布非相对论地近似于幂定律〜ε〜(-3/2),但在较高能量处略微变陡。使用“有效”电阻率的实际值,我们获得的能量和加速时间都在太阳电晕中质子加速的观测数据范围内。

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