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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-83
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-83
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

ANGEO Communicates 17 Jun 2019

ANGEO Communicates | 17 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Excitation of chorus with small wave normal angles due to BPA mechanism into density ducts

Peter A. Bespalov1,2 and Olga N. Savina2 Peter A. Bespalov and Olga N. Savina
  • 1Institute of Applied Physics RAS, Nizhny Novgorod, Russia
  • 2National Research University Higher School of Economics, Nizhny Novgorod, Russia

Abstract. We examine specific features of the realization of the beam pulse amplifier mechanism (BPA) of chorus excitation in the density ducts having a width of the order of 100–300 km with refractive reflection. The dispersion characteristics of whistler emissions in a planar duct under conditions for the fulfillment of the WKB approximation and refractive reflection from the walls of the duct are analyzed. It is shown that in the enhanced duct, discrete spectral elements of chorus with a narrow angular spectrum along the external magnetic field can be excited at frequencies somewhat lower than half the electron cyclotron frequency. In the depleted duct at frequencies somewhat higher than half the electron cyclotron frequency chorus with a narrow angular spectrum along the magnetic field can be excited. The proposed model explains the possibility of excitation of chorus with small angles of the wave normal when the BPA mechanism is implemented. It is noted that the properties of chorus, such as the intensity and a typical angle of the wave normal, can be different for the lower and upper band chorus.

Peter A. Bespalov and Olga N. Savina
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Peter A. Bespalov and Olga N. Savina
Peter A. Bespalov and Olga N. Savina
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Short summary
The paper discusses a problem concerned with the excitation of chorus with small wave normal angles along the external magnetic field in the magnetosphere. We examine the realization of the beam pulse amplifier mechanism of chorus excitation without strong anisotropy of the plasma particles distribution function in the density ducts with refractive reflection. It is shown that in the ducts, discrete spectral elements of chorus can be excited close to half the electron cyclotron frequency.
The paper discusses a problem concerned with the excitation of chorus with small wave normal...
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