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- W2007336197 abstract "Quantitative patterns of the distribution of field‐aligned current (FAC) density have been derived from gradients of the average patterns of the Hall and Pedersen currents at high latitudes under the assumption that the total current is divergence‐free. The horizontal currents were calculated from empirical convection electric field models, derived from Millstone Hill radar observations, and the ionospheric Hall and Pedersen conductances, based on satellite observations of the precipitating particle energy flux and spectrum and including an average (equinox) solar contribution. These independent empirical models, and the resultant patterns of the field‐aligned currents, are keyed to an auroral precipitation index which quantifies the intensity and spatial extent of high‐latitude particle precipitation and which is determined from a single satellite crossing of the auroral precipitation pattern. The patterns detail the spatial distribution of the currents as a function of increasing disturbance level. The magnitudes of the total single‐hemisphere currents into or out of the ionosphere are closely balanced at each activity level and increase exponentially between 0.1 and 6 MA with increasing values of the precipitation index. The interplanetary magnetic field (IMF) sector dependence of the FAC patterns is investigated for disturbed conditions. A large portion of the FAC pattern is closed by local Pedersen currents (current into the ionosphere is balanced by an equal current out of the ionosphere at that local time). This locally balanced portion of the FAC system is enhanced in the prenoon (postnoon) sector for IMF B y > +1 nT ( B y < −1 nT). In addition, there are net currents into the ionosphere postnoon and out of the ionosphere in the premidnight sector. Whereas the magnitude of these nighttime net FACs increases with increasing negative IMF B z , the magnitude and distribution of the net currents appear to be independent of the IMF B y orientation." @default.
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- W2007336197 date "1989-03-01" @default.
- W2007336197 modified "2023-09-23" @default.
- W2007336197 title "Quantitative patterns of large-scale field-aligned currents in the auroral ionosphere" @default.
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- W2007336197 doi "https://doi.org/10.1029/ja094ia03p02555" @default.
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