High‐latitude ionospheric convection models derived from Defense Meteorological Satellite Program ion drift observations and parameterized by the interplanetary magnetic field strength and direction

摘要: [1] A series of new high-latitude ionospheric convection models have been constructed using Defense Meteorological Satellite Program (DMSP) thermal ion drift measurements. The are obtained by sorting cross polar cap electrostatic potentials into magnetic latitude/magnetic local time bins. A regression analysis the in each bin is then implemented for establishing relationships to interplanetary field (IMF) three seasons: summer, winter, and equinox. linear modeling formula electrodynamics (LIMIE) yields a response average solar wind (i.e., “quasi-viscous” interaction) changes IMF By, Bz ≤ 0, > 0 components. modeled superposition first two parameters with either or component. global model created fitting results spherical harmonic function. resulting DMSP-based (DICM) fully parameterized strength direction. With this model, patterns can be generated any configuration during quiet moderate geomagnetic conditions. We compare DICM other available organized IMF. elements its quasi-viscous separate IMF-dependent terms both northern southern regions, which not explicitly found studies. DICM's seasonal dependence interhemispheric symmetry/asymmetry features show that summer cross-polar 10–15% smaller than winter potentials. latter agreement field-aligned currents voltage-current relationship required proper magnetosphere-ionosphere coupling.