Observations of non-conjugate theta aurora

N. Ostgaard, S.B. Mende, H.U. Frey, L.A. Frank, and J.B. Sigwarth


Based on simultaneous imaging data from IMAGE FUV and Polar VIS Earth
camera and DMSP particle measurements we report two events where a theta
aurora was observed in one hemisphere but not in the other. IMF control
and hemispherical conductivity differences are suggested as possible
explanations for the occurrence of non-conjugate theta aurora. 

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Geophysical Research Letters, 30, 2125, doi:10.1029/2003GL017914, 2003