Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-frequency spicule oscillations generated via mode conversion   Spicule oscillations involve high-frequency components with a typical period
approximately corresponding to $40-50$ s. The typical time scale of the
photospheric oscillation is a few minutes, and thus, the origin of this
high-frequency component is not trivial. In this study, a one-dimensional
numerical simulation is performed to demonstrate that the observed spicule
oscillations originate from longitudinal-to-transverse mode conversion that
occurs around the equipartition layer in the chromosphere. Calculations are
conducted in a self-consistent manner with the exception of additional heating
to maintain coronal temperature. The analyses indicate the following features:
(1) mode conversion efficiently excites high-frequency transverse waves; (2)
the typical period of the high-frequency waves corresponds to the
sound-crossing time of the mode conversion region; and (3) simulated
root-mean-square velocity of the high-frequency component is consistent with
the observed value. These results indicate that the observation of spicule
oscillation provides direct evidence of mode conversion in the chromosphere.

11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org