Statistics – Applications
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11c0447w&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM11C-0447
Statistics
Applications
2407 Auroral Ionosphere (2704), 2708 Current Systems (2409), 2712 Electric Fields (2411), 2722 Forecasting, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Improvements are being made in the spherical harmonic models of the high-latitude ionospheric electric potentials and field-aligned currents (FAC) as a function of the solar wind and interplanetary magnetic field (IMF). Techniques have been developed for increasing the spatial resolution of the models, which more accurately reproduce the larger gradients at the reversal boundaries. Another improvement introduces a non-linear IMF response function, which more accurately simulates the saturation effects at large IMF magnitudes. New applications for the models have also been developed, such as a technique for forecasting the ionospheric electrojet (Hall) currents, and the associated magnetic perturbations on the ground. To accomplish this, the Euler potential function that is used to map the FAC is used to derive an approximation for the A›ƒ,ª\x8F"equivalent currentA›ƒ,ªA_ in the ionosphere. From this equivalent Hall current, the magnetic perturbations on the ground are obtained. The ionospheric conductivity variations that occur as a function of both the IMF direction and dipole tilt angle (season) are implicitly contained within this FAC model, thus bypassing the need for a separate model of the conductivity. Comparisons with ground-based magnetometer illustrate the effectiveness of this technique. The FAC model can also be combined with the electric potential model to produce maps of ionospheric Joule heating as a function of the IMF.
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