Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasilinear Evolution of Kinetic Alfven Wave Turbulence and
  Perpendicular Ion Heating in the Solar Wind   The measured spectrum of kinetic Alfven wave fluctuations in the turbulent
solar wind plasma is used to calculate the electron and ion distribution
functions resulting from quasi-linear diffusion. The modified ion distribution
function is found to be unstable to long wavelength electromagnetic ion
cyclotron waves. These waves pitch angle scatter the parallel ion velocity into
perpendicular velocity which effectively increases the perpendicular ion
temperature.

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The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg