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Author Cooper, M. L. ♦ Clauer, C. R. ♦ Emery, B. A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ MAGNETIC STORMS ♦ COMPUTERIZED SIMULATION ♦ ELECTROJETS ♦ ELECTRIC POTENTIAL
Abstract Global parameters are obtained for the November 8-9, 1991, severe geomagnetic storm with the application of a slightly modified version of the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) data inversion model. Inputs to the model include ground magnetometer data, satellite electron precipitation data, satellite ion drift data, and ion drift velocities obtained from radar measurements. The authors compare two of the AMIE computed parameters, the total Joule heating and the polar cap potential, to both the AE (12) index and the AE{sub AMIE} index, an AMIE modeled AE index created specifically for severe storm times. The equation obtained from a linear fit to the total Joule heating versus the AE{sub AMIE} index, closely resembles other equations found during much less disturbed times using the AE(12) index. These results using the AE(12) index appear to saturate at a level around 1300 nT. However, this saturation is associated with the calculation of the AE(12) index and not a physical result. An apparent saturation can also be seen in the comparison of the polar cap potential with the AE(12) index, but this is not the case when using the AE{sub AMIE} index. The comparison between the polar cap potential and the AE{sub AMIE} index yields an approximate linear relationship with a correlation coefficient of 0.80. From these results, the authors find that the magnitude of the auroral electrojets and the polar cap potential drop do not show signs of saturation at the activity levels that were present during the November 8-9, 1991 severe storm. 37 refs., 9 figs., 3 tabs.
ISSN 01480227
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-10-01
Publisher Place United States
Journal Journal of Geophysical Research
Volume Number 100
Issue Number A10


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