Seminar: Nonlinear wave-electron interaction in electron phase space holes

Wednesday, October 27, 2021 - 3:00pm to 4:00pm

Speaker Cecilia Norgren, a researcher at the University of Bergen in Norway, will discuss millisecond observations of nonlinear wave-electron interaction in electron phase space holes by EDI. Phase space depletions due to electron trapping resulting in electron phase space holes are commonly observed as bipolar electric field signatures in both space and laboratory plasma. Using the Electron Drift Instrument on board the satellites of the Magnetospheric Multiscale mission, we have for the first time made direct measurements of the modulation in electron particle flux associated with individual electron phase space holes. The flux modulations are of order unity and is direct evidence of the strong nonlinear wave-electron interaction necessary to effectively thermalize beams and contribute to transforming directed drift energy to thermal energy.

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