ULF Energy Transport Induced by Magnetospheric Boundary Oscillations Bill Lotko and Jeff Proehl Thayer School of Engineering Dartmouth College Boundary.

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Presentation transcript:

ULF Energy Transport Induced by Magnetospheric Boundary Oscillations Bill Lotko and Jeff Proehl Thayer School of Engineering Dartmouth College Boundary oscillations induce internal MHD waves Internal wave power is absorbed Characterize: Wave distribution Energy transport

One-fluid, linear MHD Cold plasma  = 0 slow mode Density Dipole magnetic field Boundaries L = 5, 10 and r = 2 R E Radial boundary oscillation n = 1, m = 3, f = 6 mHz Numerical solution, dissipation Boundary-constrained, magnetic flux coordinates Approach v = 0  =  =  vv vv  =  = 

Mode Structure vv v bb b bb km/s nT PHASE QUADRATURE Parallel – compare v  and b  Azimuthal – compare v  and v DIPOLE “LENS” Compressional signal Inner magnetosphere m  6 LARGE EQUATORIAL FLOWS v ,  100 km/s at L = 7.5

Validation GOES 7 – CANOPUS Mar 1990 % Comp Azimuth, deg  || B 0246 L FLR - L GOES Ziesolleck et al. ’ nT bb bb 2 nT FLR MP

Wave Energy Flux 9  W/m  W/m 2 36  W/m 2  W/m

Compressional dipole lens Evanescent decay is counteracted by magnetic focusing at low m  Outer magnetospheric, dayside Pc 5 waves can drive plasmaspheric cavity modes Collective energy transport Mode distribution + relative phases  power flow and group propagation Wave intensity  energy pathways Conclusions Theory Program