reconnection - Plasma Physics at West Virginia University
reconnection - Plasma Physics at West Virginia University
reconnection - Plasma Physics at West Virginia University
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Observ<strong>at</strong>ional Evidence• Ramific<strong>at</strong>ion of <strong>reconnection</strong> on the dayside isconvection p<strong>at</strong>tern <strong>at</strong> the polar caps(Dungey, PRL, 1961)– Flows had been observed with ground basedmagnetometers, but <strong>at</strong>tributed to viscosityDungey, 1961• Indirect evidence of <strong>reconnection</strong> model– Direction of IMF correl<strong>at</strong>ed withauroral and geomagnetic activity(Fairfield and Cahill Jr., JGR, 1966)– Southward IMF implies magnetopauseerosion (Aubry et al., JGR, 1970)– Energetic particles from the sun reachthe field lines <strong>at</strong> the polar cap first(Fennell, JGR, 1973)• Direct evidence (ISEE measurements)– <strong>Plasma</strong> acceler<strong>at</strong>ion <strong>at</strong> a rot<strong>at</strong>ionaldiscontinuity (Paschmann et al., N<strong>at</strong>ure, 1979)– Non-zero component of B field normal tothe magnetopause (Sonnerup et al., JGR, 1981)Overwhelming evidence formagnetospheric <strong>reconnection</strong>!Made using BATS-R-US @ CCMC10
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