Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Obliquely Propagating Electromagnetic Drift Instability in the Lower
  Hybrid Frequency Range   By employing a local two-fluid theory, we investigate an obliquely
propagating electromagnetic instability in the lower hybrid frequency range
driven by cross-field current or relative drifts between electrons and ions.
The theory self-consistently takes into account local cross-field current and
accompanying pressure gradients. It is found that the instability is caused by
reactive coupling between the backward propagating whistler (fast) waves in the
moving electron frame and the forward propagating sound (slow) waves in the ion
frame when the relative drifts are large. The unstable waves we consider
propagate obliquely to the unperturbed magnetic field and have mixed
polarization with significant electromagnetic components. A physical picture of
the instability emerges in the limit of large wavenumber characteristic of the
local approximation. The primary positive feedback mechanism is based on
reinforcement of initial electron density perturbations by compression of
electron fluid via induced Lorentz force. The resultant waves are qualitatively
consistent with the measured electromagnetic fluctuations in reconnecting
current sheet in a laboratory plasma.

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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: patt-sol