skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A storm time assimilative mapping of ionospheric electrodynamics analysis for the severe geomagnetic storm of November 8-9, 1991

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}more » 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.« less

Authors:
;  [1];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. National Center for Atmospheric Research, Boulder, CO (United States); and others
Publication Date:
OSTI Identifier:
227136
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research
Additional Journal Information:
Journal Volume: 100; Journal Issue: A10; Other Information: PBD: 1 Oct 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; MAGNETIC STORMS; COMPUTERIZED SIMULATION; ELECTROJETS; ELECTRIC POTENTIAL

Citation Formats

Cooper, M L, Clauer, C R, and Emery, B A. A storm time assimilative mapping of ionospheric electrodynamics analysis for the severe geomagnetic storm of November 8-9, 1991. United States: N. p., 1995. Web. doi:10.1029/95JA01402.
Cooper, M L, Clauer, C R, & Emery, B A. A storm time assimilative mapping of ionospheric electrodynamics analysis for the severe geomagnetic storm of November 8-9, 1991. United States. doi:10.1029/95JA01402.
Cooper, M L, Clauer, C R, and Emery, B A. Sun . "A storm time assimilative mapping of ionospheric electrodynamics analysis for the severe geomagnetic storm of November 8-9, 1991". United States. doi:10.1029/95JA01402.
@article{osti_227136,
title = {A storm time assimilative mapping of ionospheric electrodynamics analysis for the severe geomagnetic storm of November 8-9, 1991},
author = {Cooper, M L and Clauer, C R and Emery, B A},
abstractNote = {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.},
doi = {10.1029/95JA01402},
journal = {Journal of Geophysical Research},
number = A10,
volume = 100,
place = {United States},
year = {1995},
month = {10}
}