Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solar wind energy flux observations in the inner heliosphere: First
  results from Parker Solar Probe   We investigate the solar wind energy flux in the inner heliosphere using
12-day observations around each perihelion of Encounter One (E01), Two (E02),
Four (E04), and Five (E05) of Parker Solar Probe (PSP), respectively, with a
minimum heliocentric distance of 27.8 solar radii ($R_\odot{}$). Energy flux
was calculated based on electron parameters (density $n_e$, core electron
temperature $T_{c}$, and suprathermal electron temperature $T_{h}$) obtained
from the simplified analysis of the plasma quasi-thermal noise (QTN) spectrum
measured by RFS/FIELDS and the bulk proton parameters (bulk speed $V_p$ and
temperature $T_p$) measured by the Faraday Cup onboard PSP, SPC/SWEAP.
Combining observations from E01, E02, E04, and E05, the averaged energy flux
value normalized to 1 $R_\odot{}$ plus the energy necessary to overcome the
solar gravitation ($W_{R_\odot{}}$) is about 70$\pm$14 $W m^{-2}$, which is
similar to the average value (79$\pm$18 $W m^{-2}$) derived by Le Chat et al
from 24-year observations by Helios, Ulysses, and Wind at various distances and
heliolatitudes. It is remarkable that the distributions of $W_{R_\odot{}}$ are
nearly symmetrical and well fitted by Gaussians, much more so than at 1 AU,
which may imply that the small heliocentric distance limits the interactions
with transient plasma structures.

32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom