Seminar: EMIC Waves in the MMS Era

Wednesday, October 28, 2020 - 3:00pm to 4:00pm


Speaker: Sarah Vines, Space Physicist at the Johns Hopkins University Applied Physics Laboratory

Abstract: Electromagnetic ion cyclotron (EMIC) waves play important roles in particle heating and loss processes in the magnetosphere. While these waves have been studied extensively over the years, particularly in the inner magnetosphere, EMIC waves in the outer magnetosphere have been less explored. In the outer magnetosphere, multiple mechanisms have been suggested to lead to EMIC wave generation due to the particular magnetic field configuration and local plasma conditions that are not generally seen within the well-known EMIC wave source regions of the inner magnetosphere. The regions of the outer magnetosphere provide a singular laboratory to explore these different parameter regimes, which can have profound effects on the wave dispersion relation, wave propagation, and subsequent resonant interactions. With the Magnetospheric Multiscale (MMS) mission, EMIC waves in the outer magnetosphere can now be more deeply explored, as the multi-point capabilities, instrumentation, and orbit of MMS allow us to directly probe EMIC wave properties. For example, investigations of EMIC waves utilizing MMS are now able to examine the wave vector in detail, as well as delve into the configuration and background plasma populations unique to the outer magnetosphere that give rise to EMIC wave generation regions. This talk highlights the contribution to our understanding and the on-going research of EMIC waves and subsequent wave-particle interactions over the course of the MMS mission.

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