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Magnetosphere: ~< 10 RE (sunward side) B⇀ ~ .3 G at surface of Earth .001 G at magnetopause (~ .0001 G in solar wind) E⇀ ~ .2 mv/m in magnetosphere (from change [[?]].) (~ 2 mv/m in solar wind) eB/mc = wB => T ~ 1/wB = moEe Bounce period ~ sEe -> min Drift period ~ min -> hr e- density: ~ 10-1000 e-/cm3 Energy: ~ 10 kev - 1 ev λB ~ < 1 m - 100 m ^ = plasma parameter = # of e- in λD3 in magnetosphere ~ ^ ~ 1010 wp <~ 10 mHz # of collisions/sec ~ Wp/^ ~ 10-4 => collisionless [[margin]] 25 5 x 10 -10 x B/ 9 x 15 -28 x 3 x 10 10 ≈ 10 3 B ~ 27 x 10 -15 x 6/ 5 x 10 -10 W = 2πv = 30 x 10 -5 T = 1/D = 2π/w ~ 3 x 10 -4 6 [[/margin]]