Localised wave generation in the inner magnetosphere: a new approach (Invited)
Thursday, 4 September 2014: 8:50 AM
Regency Ballroom (Hyatt Regency)
Clare Watt1, Alexander W Degeling2, Robert Rankin3, Colin Forsyth4, Andrew Neil Fazakerley4 and Jonathan Rae5,6, (1)University of Reading, Reading, United Kingdom, (2)University of Alberta, Physics, Edmonton, AB, Canada, (3)Univ Alberta, Edmonton, AB, Canada, (4)Mullard Space Science Lab., Dorking, United Kingdom, (5)University College London, Mullard Space Science Laboratory, Dorking, United Kingdom, (6)University of Alberta, Edmonton, AB, Canada
Abstract:
I will present results from a new model of electromagnetic wave generation in inhomogeneous plasma and relate our findings to wave-particle interactions in the Outer Radiation Belt. Theory has predicted, and observations have confirmed, that locally-generated electromagnetic waves are important for the acceleration and loss of high energy plasma in the magnetosphere. Locally-generated in this context means that large-scale magnetospheric convection creates regions of free energy in the inner magnetosphere that are unstable to electromagnetic wave generation. An important example of this process is the generation of whistler-mode waves in the dawn/dayside sector of the magnetosphere due to temperature anisotropy. In this talk, I will discuss different approaches that can be used to model wave generation and describe the new method we have created. I will present results from our new model that predict the latitudinal variation of wave spectra, and show comparisons with in-situ observations.
