G. A. Germany Optical Aeronomy Laboratory, Center for Space Plasma and Aeronomic Research, University of Alabama, Huntsville, AL 35899. The conv ection reversal boundary generally matches the UVI equatorward boundary and is almost always poleward of the boundary separating Region 1 and Region 2 currents. The separatrix between open and closed magnetic field lines matches the poleward boundary of the UVI images well during quiet periods. During dynamic periods when the separatrix moves several degrees in latitude in some sectors, the poleward boundary of the Region 1 currents matches the UVI images better. Noon is at top, circles show 10 o increments of latitude.
Color shows strength of field-aligned current density.
The pink line is magnetic separatrix between open and closed field lines. Color scale enhances faint auroral emissions. Click to get back to the SPA GRL Homepage.