Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral Features of Magnetic Fluctuations at Proton Scales from Fast to
  Slow Solar Wind   This Letter investigates the spectral characteristics of the interplanetary
magnetic field fluctuations at proton scales during several time intervals
chosen along the speed profile of a fast stream. The character of the
fluctuations within the first frequency decade, beyond the high frequency break
located between the fluid and the kinetic regime, strongly depends on the type
of wind. While the fast wind shows a clear signature of both right handed and
left handed polarized fluctuations, possibly associated with KAW and
Ion-Cyclotron waves, respectively, the rarefaction region, where the wind speed
and the Alfv\'{e}nicity of low frequency fluctuations decrease, shows a rapid
disappearance of the ion-cyclotron signature followed by a more gradual
disappearance of the KAWs. Moreover, also the power associated to perpendicular
and parallel fluctuations experiences a rapid depletion, keeping, however, the
power anisotropy in favour of the perpendicular spectrum.

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The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an