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The characteristics of dayside ionospheric convection arestudied using Northern Hemispheric SuperDARN data and DMSP particle and flowobservations when the interplanetary magnetic field (IMF) was stronglynorthward during 13:00–15:00 UT on 2 March 2002. Although IMF <i>B<sub>x</sub></i> waspositive, which is believed to favour Southern Hemisphere high-latitudereconnection at equinox, a four-cell convection pattern was observed andlasted for more than 1.5 h in the Northern Hemisphere. The reconnectionrate derived from an analysis of the Northern Hemisphere SuperDARN dataillustrates that the high-latitude reconnection was quasi-periodic, with aperiod between 4–16 min. A sawtooth-like and reverse-dispersed ion signaturewas observed by DMSP-F14 in the sunward cusp convection at around 14:41 UT,confirming that the high-latitude reconnection was pulsed. Accompanying thepulsed reconnection, strong antisunward ionospheric flow bursts wereobserved in the post-noon LLBL region on closed field lines, propagating withthe same speed as the plasma convection. DMSP flow data show that a similarflow pattern and particle precipitation occurred in the conjugate Southern Hemisphere

Dayside flow bursts and high-latitude reconnection when the IMF is strongly northward