Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus

TitleNonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus
Publication TypeJournal Article
Year of Publication2015
AuthorsFu, X, Guo, Z, Dong, C, S. Gary, P
JournalGeophysical Research Letters
Date Published05/2015
Keywordsbanded chorus; nonlinear theory; subcyclotron resonance
AbstractAn interesting characteristic of magnetospheric chorus is the presence of a frequency gap at ω≃0.5Ωe, where Ωe is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near 0.3Ωe and 0.6Ωe. Here we present a novel nonlinear mechanism for the formation of these gaps using Hamiltonian theory and test particle simulations in a homogeneous, magnetized, collisionless plasma. We find that an oblique whistler wave with frequency at a fraction of the electron cyclotron frequency can resonate with electrons, leading to effective energy exchange between the wave and particles.
URLhttp://doi.wiley.com/10.1002/2015GL064182
DOI10.1002/2015GL064182
Short TitleGeophys. Res. Lett.


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