Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of spike-like structures near the front of type-II bursts   Aims. We examine high time resolution dynamic spectra for fine structures in
type II solar radio bursts Methods. We used data obtained with the (SAO)
receiver of the Artemis-JLS (ARTEMIS-IV) solar radio spectrograph in the
450-270 MHz range at 10 ms cadence and identified more than 600 short,
narrowband features. Their characteristics, such as instantaneous relative
bandwidth and total duration were measured and compared with those of spikes
embedded in type IV emissions. Results. Type II associated spikes occur mostly
in chains inside or close to the slowly drifting type II emission. These spikes
coexist with herringbone and pulsating structures. Their average duration is 96
ms and their average relative bandwidth 1.7%. These properties are not
different from those of type IV embedded spikes. It is therefore possible that
they are signatures of small-scale reconnection along the type II shock front.

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The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph