1. 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

2. 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  =  = 

3. Mode Structure vv v bb b bb 1000 100 10 1 km/s 100 10 1.1 nT 224 84 100 15 2 224 84.5.1 3 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

4. Validation 100 50 0 GOES 7 – CANOPUS Mar 1990 % Comp Azimuth, deg 90 -90 0  || B 0246 L FLR - L GOES Ziesolleck et al. ’96 100 nT bb bb 2 nT FLR MP

5. Wave Energy Flux 9  W/m 2 535  W/m 2 36  W/m 2  W/m 2 1000 100 10 1

6. 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