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Astron. Astrophys. 355, 804-808 (2000)


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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] cm-3, whereas outside the tube it is [FORMULA] cm-3.

Key words: polarization – planets and satellites: individual: Jupiter – radio continuum: solar system

Send offprint requests to: V.E. Shaposhnikov

© European Southern Observatory (ESO) 2000

Online publication: March 9, 2000

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