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Astron. Astrophys. 355, 804-808 (2000)
Origin of emission polarization in the great arc of the Io-A decametric storm
V.E. Shaposhnikov 1,
H.O. Rucker 2 and
V.V. Zaitsev 1
1 Institute of Applied Physics, Russian Academy of Sciences, Uljanov St. 46, 603600 Nizhny Novgorod, Russia
2 Space Research Institute, Austrian Academy of Sciences, Halbaerthgasse 1, 8010 Graz, Austria
Received 24 March 1999 / Accepted 20 January 2000
Abstract
We consider the origin of a circular polarization which was
observed in the great arc in the Io-A decametric storm of Nov.2, 1988.
Our consideration is based on the model of the origin of a decametric
emission polarization employing the idea of moderate linear mode
coupling. We show that a reasonable explanation of the polarization of
the great arc is possible if the emission is generated in the
instantaneous Io flux tube (IFT). We conclude that the plasma density
in IFT is approximately three times greater than the one in the
vicinity of IFT. At the heights corresponding to the 30 MHz
electron gyrofrequency level, we estimate the plasma density in IFT to
be ![[FORMULA]](img1.gif)
cm-3, whereas
outside the tube it is
![[FORMULA]](img2.gif)
cm-3.
Key words: polarization 
planets and satellites: individual:
Jupiter
radio continuum: solar system
Send offprint requests to: V.E. Shaposhnikov
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. The event of November 2, 1988
- 3. The origin of the emission polarization in the event of November 2, 1988
- 4. Discussion
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: March 9, 2000
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