first_imgWe report in-situ detection by two spacecraft of oppositely directed jets of plasma emanating from a magneticreconnection site at the Earth’s dayside magnetopause, confirming a key element inherent in all reconnectionscenarios. The dual-spacecraft (Equator-S and Geotail) observations at the flank magnetopause, together withSuperDARNHalley radar observations of the subsolar cusp region, reveal the presence of a rather stable and extendedreconnection line which lies along the equatorial magnetopause. These observations were made under persistentsouthward interplanetary magnetic field (IMF) conditions, implying that under these conditions the reconnection sitesare determined by the large-scale interactions between the solar wind magnetic field and the dayside magnetosphere,rather than by local conditions at the magnetopause. Control by local conditionswould result in patchy reconnection, distributed in a less well-organized fashion over the magnetopause surface.last_img read more