Simultaneous Cluster and IMAGE Observations of Cusp Reconnection and Auroral Proton Spot under Northward IMF Conditions T. Phan, H. Frey, S. Frey, L. Peticolas, S. Fuselier, C. Carlson, H. Rme, J.-M. Bosqued, A. Balogh, M. Dunlop, I. Dandouras, J.-A. Sauvaud, S. Mende, J. McFadden, G. Parks, L. Kistler, E. Moebius, B. Klecker, G. Paschmann, M. Fujimoto, S. Petrinec, M. F. Marcucci, A. Korth, and R. Lundin On March 18, 2002, under northward interplanetary magnetic field (IMF) and high (~15 nPa) solar wind dynamic pressure conditions, Cluster observed reconnection signatures and the passage of an X-line at the large (~175 deg.) magnetic-shear high-latitude magnetopause. The observations are consistent with the occurrence of a reconnection site poleward of the cusp and in the vicinity of the spacecraft. At the same time IMAGE observed a bright spot poleward of the dayside auroral oval resulting from precipitating protons into the atmosphere. The intensity of the bright spot is consistent with the energy flux contained in the plasma jets observed by Cluster. Using the Tsyganenko-01 magnetic field model with enhanced solar wind pressure, the Cluster magnetopause location is mapped to the vicinity of the IMAGE proton spot. Mapping the boundary of the auroral spot out to the magnetopause implies an X-line of at least 3.6 RE in yGSM. These observations confirm the reconnection source of the dayside auroral proton spot. _______________ Presented at the Magnetospheric Imaging Workshop, Yosemite National Park, California, U.S.A., Feb. 9 - 13, 2003.