Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh52a..14a&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH52A-14
Physics
2475 Polar Cap Ionosphere, 2409 Current Systems (2708), 2431 Ionosphere/Magnetosphere Interactions (2736)
Scientific paper
Data from the Iridium engineering magnetometers provide global coverage of the low altitude field aligned current signatures [Anderson et al., 2000]. Even though the integration times to derive patterns of the currents are on the order of 1 hour, this is far shorter than the time required to characterize the currents using data from single spacecraft. This has two significant implications. First the patterns should more faithfully reflect the actual currents than a statistical compilation of observations binned according to some measure of the magnetospheric state. Second, one can be selective in choosing time intervals for which solar wind variations or magnetospheric dynamics should have a minimum effect on the observations. We use 1-hour integrations during periods of stable IMF orientation (within 25 degrees in direction for at least 3 hours) and quasi-perpendicular shock conditions (cone angles between 45 and 135 degrees) to construct a data base of field aligned current patterns. These patterns are then correlated with IMF clock angle, solar wind velocity and magnitude of the Y-Z plane projection of the IMF. Seasonal effects are calibrated and modeled using the simultaneous northern and southern hemisphere observations. To extend the model to storm-time conditions of particular interest to the space weather community, we use the Iridium key parameter measures of FAC latitude and maximum magnetic perturbation [Anderson et al., 2002] to scale the intensity and latitudinal extension of the FAC patterns. Even though the patterns for storm-time may not accurately reflect the detailed configurations of the currents this is the first model for which the effects of saturation both in intensity and latitudinal expansion are represented.
Anderson Benjamin J.
Waters Colin L.
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