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. 2023 Jan 27;14:438. doi: 10.1038/s41467-023-36095-x

Fig. 4. Evolution of electron phase space distributions.

Fig. 4

a Initially electron phase space distribution (f) is assumed to be rather isotropic, which is correspondingly deformed under 2-hour scattering effect of different waves. b Combined diffusion of LBC and SH eventually forms the pancake distribution, after electrons near the loss cone are rapidly driven into the ionosphere. c Lower-band chorus (LBC) only cause rapid loss of electrons above 4 keV with trapped electrons affected slightly. d Second-harmonic (SH) emissions alone contribute to the evolutions of almost all stimulated electrons, especially near 2 keV.