Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decayless longitudinal oscillations of a solar filament maintained by
  quasi-periodic jets   Context: As a ubiquitous phenomenon, large-amplitude longitudinal filament
oscillations usually decay in 1--4 periods. Recently, we observed a decayless
case of such oscillations in the corona. Aims: We try to understand the
physical process that maintains the decayless oscillation of the filament.
Methods: Multi-wavelength imaging observations and magnetograms are collected
to study the dynamics of the filament oscillation and its associated phenomena.
To explain the decayless oscillations, we also perform one-dimensional
hydrodynamic numerical simulations using the MPI-AMRVAC code. Results: In
observations, the filament oscillates decaylessly with a period of $36.4 \pm
0.3$ min for almost 4 hours before eruption. During oscillations, four
quasi-periodic jets emanate from a magnetic cancellation site near the
filament. The time interval between neighboring jets is $\sim 68.9 \pm 1.0$
min. Numerical simulations constrained by the observations reproduced the
decayless longitudinal oscillations. However, it is surprising to find that the
period of the decayless oscillations is not consistent with the pendulum model.
Conclusions: We propose that the decayless longitudinal oscillations of the
filament are maintained by quasi-periodic jets, which is verified by the
hydrodynamic simulations. More importantly, it is found that, when driven by
quasi-periodic jets, the period of the filament longitudinal oscillations
depends also on the driving period of the jets, not simply the pendulum period.
With a parameter survey in simulations, we derived a formula, by which one can
derive the pendulum oscillation period using the observed period of decayless
filament oscillations and the driving periods of jets.

19
The categories of this paper are: eess
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an