Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a transitional regime of electron resonant interaction with
  whistler-mode waves in inhomogeneous space plasma   Resonances with electromagnetic whistler-mode waves are the primary driver
for the formation and dynamics of energetic electron fluxes in various space
plasma systems, including shock waves and planetary radiation belts. The basic
and most elaborated theoretical framework for the description of the integral
effect of multiple resonant interactions is the quasi-linear theory, that
operates through electron diffusion in velocity space. The quasi-linear
diffusion rate scales linearly with the wave intensity, D(QL) is proportional
to Bw2, which should be small enough to satisfy the applicability criteria of
this theory. Spacecraft measurements, however, often detect whistle-mode waves
sufficiently intense to resonate with electrons nonlinearly. Such nonlinear
resonant interactions imply effects of phase trapping and phase bunching, which
may quickly change the electron fluxes in a non-diffusive manner. Both regimes
of electron resonant interactions (diffusive and nonlinear) are well studied,
but there is no theory quantifying the transition between these two regimes. In
this paper we describe the integral effect of nonlinear electron interactions
with whistler-mode waves in terms of the time-scale of electron distribution
relaxation, is about inverse D(NL). We determine the scaling of D(NL) with wave
intensity Bw2 and other main wave characteristics, such as wave-packet size.
The comparison of D(QL) and D(NL) provides the range of wave intensity and
wave-packet sizes where the electron distribution evolves at the same rates for
the diffusive and nonlinear resonant regimes. The obtained results are
discussed in the context of energetic electron dynamics in the Earth's
radiation belt.

13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex