Nonaxisymmetrical beaming cone of radio waves produced by cyclotron maser instability in inhomogeneous medium

Abstract : The results we have recently obtained about the beaming of the Io-controlled decameter Jovian radio emission allow us to conclude that this radiation is emitted in a hollow cone flattened in a particular direction linked to the local magnetic field. The existence of such an emission cone leads us to understand the location of the Io-controlled sources (Io-A, Io-B, Io-C, and Io-D) in the CML-Io phase diagram and to interpret their dependence on the longitude as the manifestation of a Jovian active longitude sector, where the emission mechanism is the most efficient. We study the origin of the flattening of the emission cone in the framework of a radio emission produced by the cyclotron maser instability in an inhomogeneous medium where the local magnetic field B and the gradient of its modulus ∇B are not parallel, i.e., in a geometry without axial symmetry. We consider that the radiation propagates in the source region in the X-mode near its cutoff frequency.
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https://hal-insu.archives-ouvertes.fr/insu-01145326
Contributor : Catherine Cardon <>
Submitted on : Thursday, April 23, 2015 - 8:06:53 PM
Last modification on : Tuesday, May 14, 2019 - 11:06:48 AM

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  • HAL Id : insu-01145326, version 1

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Patrick H. M. Galopeau, Mohammed Boudjada, Helmut Rucker. Nonaxisymmetrical beaming cone of radio waves produced by cyclotron maser instability in inhomogeneous medium. EGU General Assembly 2015, Apr 2015, Vienna, Austria. pp.EGU2015-10294. ⟨insu-01145326⟩

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