Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three dimensional MHD Modeling of Vertical Kink Oscillations in an
  Active Region Plasma Curtain   Observations on 2011 August 9 of an X6.9-class flare in active region (AR)
11263 by the Atmospheric Imaging Assembly (AIA) on-board the Solar Dynamics
Observatory (SDO), were followed by a rare detection of vertical kink
oscillations in a large-scale coronal active region plasma curtain in EUV
coronal lines. The damped oscillations with periods in the range 8.8-14.9 min
were detected and analyzed recently. Our aim is to study the generation and
propagation of the MHD oscillations in the plasma curtain taking into account
realistic 3D magnetic and density structure of the curtain. We also aim at
testing and improving coronal seismology for more accurate determination of the
magnetic field than with standard method. We use the observed morphological and
dynamical conditions, as well as plasma properties of the coronal curtain based
on Differential Emission Measure (DEM) analysis to initialize a 3D MHD model of
its vertical and transverse oscillations by implementing the impulsively
excited velocity pulse mimicking the flare generated nonlinear fast
magnetosonic propagating disturbance interacting with the curtain obliquely.
The model is simplified by utilizing initial dipole magnetic field, isothermal
energy equation, and gravitationally stratified density guided by observational
parameters. Using the 3D MHD model, we are able to reproduce the details of the
vertical oscillations and study the process of their excitation by nonlinear
fast magnetosonic pulse, propagation, and damping, finding agreement with the
observations. We estimate the accuracy of simplified slab-based coronal
seismology by comparing the determined magnetic field strength to actual values
from the 3D MHD modeling results and demonstrate the importance of taking into
account more realistic magnetic geometry and density for improving coronal
seismology.

14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys