Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Turbulent Heating Rate in Strong MHD Turbulence with Nonzero Cross
  Helicity   Different results for the cascade power in strong, incompressible MHD
turbulence with nonzero cross helicity appear in the literature. In this paper,
we discuss the conditions under which these different results are valid. We
define z+ to be the rms amplitude of Alfven waves propagating parallel to the
background magnetic field, and z- to be the rms amplitude of Alfven waves
propagating anti-parallel to the background magnetic field. Nonzero cross
helicity implies that z+ and z- differ, and we take z- to be less than z+. We
find that the mechanism that generates the z- fluctuations strongly affects the
cascade power, because it controls the coherence time for interactions between
oppositely directed wave packets at the outer scale. In particular, for fixed
values of z+ and z-, the cascade power is in many cases larger when the z-
fluctuations are generated by the reflection of z+ fluctuations than when the
z- fluctuations are generated by forcing that is only weakly correlated with
the z+ fluctuations.

2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
19
The categories of this paper are: eess