Average electric field magnitudes (arrow lengths) and convection directions
(arrow orientation) from approximately 15 months of Cluster EDI data. The
measurements were mapped to the equatorial plane and binned using 1-hr local
time intervals and 1 RE distance intervals from 4 to 10 RE. The four panels
correspond to BZ<0 (top), BZ>0 (bottom), corotating frame (left) and inertial
frame (right).
Last modified: Thu Mar 25 13:29:47 EST 2004