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arXiv 0801.3786astro-ph
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太阳耀斑中粒子的快模加速

Particle Acceleration by Fast Modes in Solar Flares

Huirong Yan, A. Lazarian, V. Petrosian

摘要:

本文讨论了太阳耀斑中粒子加速的快模问题,这些快模可能在重联过程中被激发,并经历级联和阻尼。我们将计算扩展到超越准线性近似,并比较了通过渡越时间阻尼和陀螺共振相互作用的加速度和散射。我们发现,加速度是由所谓的渡越时间阻尼机制。我们估计的总能量转移到粒子,并表明,我们的方法提供了足够准确的结果,我们比较这个速度与能量损失率。快速模式的散射似乎足以防止质子在加速过程中逃离系统。另一方面,电子的限制需要等离子体波的存在。通过这里描述的太阳耀斑条件下的过程,电子可以被加速到GeV能量。

英文摘要:

We address the problem of particle acceleration in solar flares by fast modes which may be excited during the reconnection and undergo cascade and are subjected to damping. We extend the calculations beyond quasilinear approximation and compare the acceleration and scattering by transit time damping and gyroresonance interactions. We find that the acceleration is dominated by the so called transit time damping mechanism. We estimate the total energy transferred into particles, and show that our approach provides sufficiently accurate results We compare this rate with energy loss rate. Scattering by fast modes appears to be sufficient to prevent the protons from escaping the system during the acceleration. Confinement of electrons, on the other hand, requires the existence of plasma waves. Electrons can be accelerated to GeV energies through the process described here for solar flare conditions.

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