Ion energization by ELF wave packets formed of lightning‐induced emission in the low‐altitude magnetosphere

Abstract

We investigate a new type of resonant interaction between suprathermal ions and specific wave packets of ion cyclotron waves in which a spatially dependent wave frequency is close to the local ion cyclotron frequency, while the magnitude of the wave vector at a local point increases linearly with time. We argue that such wave packets are naturally formed of lightning‐induced emission. This type of resonant wave‐particle interaction, which has not been considered so far, appears to be very efficient and to result in essential consequences for both particles and waves, namely, a strong nondiffusive particle energization and simultaneous wave absorption. Since lightning strokes happen persistently over the terrestrial globe, the mechanism suggested in this paper constitutes a continual means of ion energization in the near‐Earth space.

Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models

“…The effect of lightning-induced emission on ion dynamics above thunderstorm cells has been discussed by several authors (see, e.g., Gurnett and Brice 1966;Bell et al 1993). Recently, a new mechanism of ion energization due to interaction with lightning-induced emission has been considered (Shklyar and Kuzichev 2014). A part of the electromagnetic energy induced by lightning in the ELF frequency band penetrates into the low-altitude magnetosphere and starts propagating there as slow ion cyclotron waves (see, e.g., Shklyar et al 2012, and references therein).…”

Modeling the Propagation of Extremely Low Frequency Electromagnetic Emissions From the Power Lines to the Inner Magnetosphere in a Dipole Field

“…In this case, the field line ( L = 1.235) is so close to the $${f}_{{\text{cHe}}^{+}}$$ surface at the magnetic equator that the edge of the wavefront and the Poynting flux of the L1 mode is tangent to the $${f}_{{\text{cHe}}^{+}}$$ surface, which makes MLAT = 20° a critical magnetic latitude of the power line. The L1 mode transformed from the R1 mode of PLE generated by the power lines at higher magnetic latitudes may be guided along the field lines after crossing the $${f}_{{\text{cHe}}^{+}}$$ surface and get absorbed through ion cyclotron resonance (e.g., Gurnett & Brice, 1966; Shklyar & Kuzichev, 2014) before reaching the magnetic equator.…”

Some aspects of magnetosphere ionosphere relations

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