Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of kink waves in solar spicules   Height series of H${\alpha}$ spectra in solar limb spicules obtained with the
53 cm coronagraph of the Abastumani Astrophysical Observatory are analyzed.
Each height series covered 8 different heights beginning at 3800 km above the
photosphere. The spatial difference between neighboring heights was 1$^{\prime
\prime}$, consequently $\sim$ 3800 - 8700 km distance above the photosphere has
been covered. The total time duration of each height series was 7 s. We found
that nearly 20% of measured height series show a periodic spatial distribution
of Doppler velocities. We suggest that this spatial periodicity in Doppler
velocity is caused by propagating kink waves in spicules. The wave length is
found to be $\sim$ 3500 km. However the wave length tends to be $\sim$ 1000 km
at the photosphere due to the height variation of the kink speed. This probably
indicates to a granular origin for the waves. The period of waves is estimated
to be in the range of 35-70 s. These waves may carry photospheric energy into
the corona, therefore can be of importance in coronal heating.

9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph