Time-dependent convection at high latitudes |
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Authors: | D W Idenden R J Moffett S Quegan T J Fuller-Rowell |
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Institution: | (1) School of Mathematics and Statistics, University of Sheffield, The Hicks Building, Sheffield, S3 7RH, UK;(2) CIRES, University of Colorado/NOAA Space Environment Laboratory, 325 Broadway, Boulder, CO 80303, USA |
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Abstract: | A fully time-dependent ionospheric convection model, in which electric potentials are derived by an analytic solution of Laplace s equation, is described. This model has been developed to replace the empirically derived average convection patterns currently used routinely in the Sheffield/SEL/UCL coupled thermosphere/ionosphere/plasmasphere model (CTIP) for modelling disturbed periods. Illustrative studies of such periods indicate that, for the electric field pulsation periods imposed, long-term averages of parameters such as Joule heating and plasma density have significantly different values in a time-dependent model compared to those derived under the same mean conditions in a steady-state model. These differences are indicative of the highly non-linear nature of the processes involved. |
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