Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of a pulse driven cool polar jet by SDO/AIA   Context. We observe a solar jet at north polar coronal hole (NPCH) using SDO
AIA 304 {\deg}A image data on 3 August 2010. The jet rises obliquely above the
solar limb and then retraces its propagation path to fall back. Aims. We
numerically model this observed solar jet by implementing a realistic (VAL-C)
model of solar temperature. Methods. We solve two-dimensional ideal
magnetohydrodynamic equations numerically to simulate the observed solar jet.
We consider a localized velocity pulse that is essentially parallel to the
background magnetic field lines and initially launched at the top of the solar
photosphere. The pulse steepens into a shock at higher altitudes, which
triggers plasma perturbations that exhibit the observed features of the jet.
The typical direction of the pulse also clearly exhibits the leading front of
the moving jet. Results. Our numerical simulations reveal that a large
amplitude initial velocity pulse launched at the top of the solar photosphere
produces in general the observed properties of the jet, e.g., upward and
backward average velocities, height, width, life-time, and ballistic nature.
Conclusions. The close matching between the jet observations and numerical
simulations provides first strong evidence for the formation of this jet by a
single velocity pulse. The strong velocity pulse is most likely generated by
the low- atmospheric reconnection in the polar region which results in
triggering of the jet. The downflowing material of the jet most likely vanishes
in the next upcoming velocity pulses from lower solar atmosphere, and therefore
distinctly launched a single jet upward in the solar atmosphere is observed.

33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph