Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of Alfv\'en wave dynamics on the large scale properties of the
  solar wind: comparing an MHD simulation with PSP E1 data   During Parker Solar Probe's first orbit, the solar wind plasma has been
observed in situ closer than ever before, the perihelion on November 6th 2018
revealing a flow that is constantly permeated by large amplitude Alfv\'enic
fluctuations. These include radial magnetic field reversals, or switchbacks,
that seem to be a persistent feature of the young solar wind. The measurements
also reveal a very strong, unexpected, azimuthal velocity component. In this
work, we numerically model the solar corona during this first encounter,
solving the MHD equations and accounting for Alfv\'en wave transport and
dissipation. We find that the large scale plasma parameters are well
reproduced, allowing the computation of the solar wind sources at Probe with
confidence. We try to understand the dynamical nature of the solar wind to
explain both the amplitude of the observed radial magnetic field and of the
azimuthal velocities.

16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int