A comparison of whistler data from four consecutive magnetically quiet days July 4--7, 1973, confirms and extends previous whistler results on quiet day cross-L drift motions in the outer plasmasphere near L=4. A pattern of morningside outward and afternoonside inward drifts at ?200 m/s (‖Ew‖?0.1 mV/m) was repeated daily. (Ew is the westward component of the magnetospheric electric field at the equator.) Over the four days the onset of the outward drift activity shifted backward in time from ?1000 MLT to ?0500 MLT. There was a corresponding shift in the harmonic series representing Ew. On the first day the largest term was semidiurnal; on the fourth day it was diurnal. The data provided an opportunity to investigate in some detail the cross-L drift velocity at spaced L values. During seven periods of the order of 1-hour duration, drifts of the order of 200 m/s could be simultaneously measured at points spaced over approximately 1 RE in equatorial radius. The inferred equatorial east-west electric fields near L=4 decreased at least as rapidly as L-3/2 with increasing distance. (In a dipole field an equatorial variation as L-3/2 would be expected if an east-west field that is constant with latitude were present at ionospheric heights.) There is some indication that the faster drop-offs, with variation roughly as L-4, occurred during the first two days of quieting following disturbance and that the falloff approached L-3/2 on the third and fourth days. It is speculated that day-to-day changes in subauroral ionospheric conductivity during the quiet period may have been responsible for the 'shielding' of the field from high latitudes. The data strongly support the concept that the observed electric fields originate at middle to low latitudes, apparently in an ionospheric dynamo process. The noon-midnight asymmetry (or noon bulge) of the plasmasphere reported from spacecraft appears to be a consequence of the quiet day flow pattern.