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
Received 24 March 1999 / Accepted 20 January 2000
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 cm-3, whereas outside the tube it is cm-3.
Key words: polarization planets and satellites: individual: Jupiter radio continuum: solar system
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© European Southern Observatory (ESO) 2000
Online publication: March 9, 2000