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A minimal model of parallel electric field generation in a transversely inhomogeneous plasma | | David Tsiklauri
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16 Jan 2007 | | Abstract: | We study the generation of parallel electric fields by virtue of propagation of ion cyclotron waves in the plasma with a transverse density inhomogeneity. Using two-fluid, cold plasma linearised equations, we show for the first time that $E_{parallel}$ generation can be understood by an analytic equation that couples $E_{parallel}$ to the transverse electric field. We prove that the minimal model required to reproduce previous kinetic results on $E_{parallel}$ generation is the two-fluid, cold plasma approximation in the linear regime. In this simplified model, the generated $E_{parallel}$ amplitude e.g. for plausible solar coronal parameters attains values of $10^4$ Vm$^{-1}$. By considering the numerical solutions we also show that the cause of $E_{parallel}$ generation is the charge separation induced by the transverse density inhomogeneity. The model also correctly reproduces the previous kinetic results in that only electrons are accelerated (along the background magnetic field), while ions do not accelerate. | | Source: | arXiv, astro-ph/0701464 | | Services: | Forum | Review | PDF | Favorites | |
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