The Cusp Aurora in the Conjugate Hemispheres of the Earth N. Ostgaard, S.B. Mende, H.U. Frey, T.J. Immel, J.B. Sigwarth, and L.A. Frank In this paper we examine the Earth's cusp aurora associated with high latitude lobe reconnection. The cusp aurora is observed simultanously in both the southern and northern hemispheres in similar wavelengths by the cameras on IMAGE and Polar satellites. Due to the high solar wind pressure both the proton and electron aurorae are fairly bright, dominated by ~8 keV protons and 0.5-1 keV electrons. As predicted by theory, the longitudinal asymmetric location of the cusp aurora is strongly controlled by the IMF By component. The southern cusp aurora is observed several degrees poleward of the northern cusp aurora and can be attributed to either a tilt effect or an IMF Bx effect. These rare observations also confirm our earlier findings that theta aurora can be a non-conjugate phenomenon controlled by the IMF Bx component. _______________ Presentation, Fall A.G.U. Meeting, San Francisco, CA, 13-17 December 2004