Abstract
We provide high-resolution maps of quasi-static Poynting flux (PF) in
each hemisphere based on nine-satellite years of Defense Meteorological
Satellite Program (DMSP) data. Conjugate comparisons from
~850 km reveal more quasi-static PF arriving in the
northern hemisphere (NH) than the southern hemisphere (SH). This
tendency is clear in the dawn-dusk sectors and during intervals when Kp
< 3, which accounts for ~80% of the study
interval. Summer-to-summer comparisons indicate this asymmetry is
partially associated with more NH solar illumination, which supports
stronger NH field-aligned currents (FAC). Differing hemispheric FAC
configurations may also play a role. Our findings support and broaden
earlier reports of similar NH preference for the deposition of Alfvenic
PF. Regionally the NH has stronger dusk-region PF, while the SH has
stronger mid-morning PF. We find PF deposition in the near-cusp regions
that rivals and often exceeds the PF intensity in the auroral zones.