EGU22-13168, updated on 28 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Role of the nonlinear Landau resonance in intense precipitations of sub-relativistic electrons

Dmitri Vainchtein1, Anton V. Artemyev2, and Xiaojia Zhang2
Dmitri Vainchtein et al.
  • 1Nyheim Plasma Institute, Drexel University, Camden, NJ, USA
  • 2Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, USA

Precipitations of energetic electrons into the Earth's atmosphere are important factor of radiation belt dynamics and the magnetosphere-ionosphere coupling. Microbursts, which are the most intense of such precipitations, are short-living bursts of precipitating fluxes detected by low-altitude spacecraft. Due to wide energy ranges of observed microbursts and their transient nature, they are generally associated with energetic electron scattering into the loss-cone via cyclotron resonance with field-aligned intense whistler-mode chorus waves. In this study, we show that intense sub-relativistic precipitations may be generated via the nonlinear Landau resonance of electrons with very oblique whistler-mode waves. Such precipitations are not associated with electron flux decrease in the radiation belts, but rather indicate the rapid electron acceleration up to 100-200 keV around the equator. We combine theoretical model of the nonlinear Landau resonances and equatorial observations of very oblique intense whistler-mode waves. The proposed scenario of intense sub-relativistic precipitations demonstrate the importance of very oblique whistler-mode waves for the radiation belt dynamics.

How to cite: Vainchtein, D., Artemyev, A. V., and Zhang, X.: Role of the nonlinear Landau resonance in intense precipitations of sub-relativistic electrons, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-13168,, 2022.