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Latitudinal extension of the sources of continuum radiations

Abstract : The electromagnetic radio emissions known as 'continuum radiation' are widely observed for decades in planetary magnetospheres. Although their main source location is well identified for Earth in the vicinity of the equatorial plasmapause and its generation mechanism generally associated with electrostatic emissions arising between half harmonics of the electron gyro harmonics, many details of their characteristics and source are still missing. Recent observations had suggested new features in their description. For example, studies based on the Whisper instruments have shown that continuum sources can also be located at mid latitudes and can be generated at exact harmonics of the electron frequency. The higher perigee of the present phase of the Cluster extended mission allows the spacecraft to skim the sources regions close to the plasmapause and to explore their latitudinal extension thanks to its polar orbit. This higher perigee also allows to get Peace data, seldom available at the lower perigees earlier in the mission, to characterize the electrons populations at the origin of these emissions. We present here the first analysis of the best events observed so far.
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https://hal-cnrs.archives-ouvertes.fr/hal-02993253
Contributor : Patrick Canu <>
Submitted on : Wednesday, November 18, 2020 - 5:30:07 PM
Last modification on : Wednesday, December 2, 2020 - 11:59:29 AM

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  • HAL Id : hal-02993253, version 1

Citation

Patrick Canu, A Fazakerley, X Vallières, J Rauch, P Decreau, et al.. Latitudinal extension of the sources of continuum radiations. Cluster 29th workshop, Oct 2019, Lanzarote Canary Islands, Spain. ⟨hal-02993253⟩

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