On the connection between microbursts and nonlinear electronic structures in planetary radiation belts

Adnane Osmane*, Lynn B. Wilson, Lauren Blum, Tuija I. Pulkkinen

*Tämän työn vastaava kirjoittaja

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    20 Sitaatiot (Scopus)
    507 Lataukset (Pure)


    Using a dynamical-system approach, we have investigated the efficiency of large-amplitude whistler waves for causing microburst precipitation in planetary radiation belts by modeling the microburst energy and particle fluxes produced as a result of nonlinear wave-particle interactions. We show that wave parameters, consistent with large-amplitude oblique whistlers, can commonly generate microbursts of electrons with hundreds of keV-energies as a result of Landau trapping. Relativistic microbursts (> 1 MeV) can also be generated by a similar mechanism, but require waves with large propagation angles theta(kB) > 50 degrees and phase-speeds v(Phi) >= c/9. Using our result for precipitating density and energy fluxes, we argue that holes in the distribution function of electrons near the magnetic mirror point can result in the generation of double layers and electron solitary holes consistent in scales (of the order of Debye lengths) to nonlinear structures observed in the radiation belts by the Van Allen Probes. Our results indicate a relationship between nonlinear electrostatic and electromagnetic structures in the dynamics of planetary radiation belts and their role in the cyclical production of energetic electrons (E >= 100 keV) on kinetic timescales, which is much faster than previously inferred.

    JulkaisuThe Astrophysical Journal
    DOI - pysyväislinkit
    TilaJulkaistu - 10 tammik. 2016
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu


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