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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 5 | Copyright
Ann. Geophys., 36, 1201-1206, 2018
https://doi.org/10.5194/angeo-36-1201-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

ANGEO Communicates 18 Sep 2018

ANGEO Communicates | 18 Sep 2018

An excitation mechanism for discrete chorus elements in the magnetosphere

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

Abstract. A beam pulsed amplifier mechanism responsible for effective amplification of short very low frequency (VLF) electromagnetic pulses is proposed. Effective amplification near the magnetic equator outside the plasmasphere is considered. A conditional growth rate of short electromagnetic pulses is calculated. Obtained results can explain some important features of the oblique electromagnetic chorus emissions without hiss-like radiation background.

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A VLF chorus is a very intense electromagnetic plasma wave that is naturally excited as a succession of discrete emissions near the magnetic equatorial plane outside the plasmasphere. We introduce a mechanism of chorus excitation under conditions when known mechanisms become ineffective. This kind of excitation is related to the amplification of short electromagnetic pulses from the noise level even in a stable plasma. Obtained results can explain some important features of the chorus emissions.
A VLF chorus is a very intense electromagnetic plasma wave that is naturally excited as a...
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