Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contribution of polar plumes to fast solar wind   Context. Several physical properties of solar polar plumes have been
identified by different published studies, however such studies are rare and
sometimes in disagreement. Aims. The purpose of the present work is to analyze
a set of SOHO/UVCS data dedicated to the observation of plumes and to obtain a
picture of the physical properties of plumes in the intermediate solar corona
through a self-consistent analysis. Methods. We applied the Doppler Dimming
technique to data acquired by SOHO/UVCS in April 1996, which was during the
very early phases of the mission. From this we derived outflow speeds and
electron densities. We used SOHO/LASCO images as context data in order to
better identify plume and interplume regions in the UVCS field of view.
Results. The results we obtain demonstrate that in three cases out of four
plumes expand with outflow speeds comparable to those of interplumes, and in a
single case with lower speeds. We estimate that the contribution of plumes to
the wind coming from the solar poles is about 20%, and that different plumes
provide a different contribution, possibly according to different stages of
their evolution. Conclusions. We conclude that plumes are not static
structures, and that they contribute significantly to the wind coming from the
solar poles.

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The categories of this paper are: eess
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat