LiMIE: Linear Modeling of Ionospheric Electrodynamics


Brief description Run LiMIE on-line

The LiMIE is a Web-based interface to the following models of ionospheric electrodynamics:

The IZMEM model utilized the linear regression relationships between the interplanetary magnetic field (IMF) and ground-based geomagnetic field variations at high latitudes. This approach provides better parameterization of the number of ionospheric electrodynamic parameters by the IMF strength and direction for a given model of ionospheric conductivity; then the parameter distributions can be mapped over both the northern and southern polar regions. The IZMEM model was developed at the beginning of 1980's in the Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation (IZMIRAN, Troitsk, Moscow Region, Russia) [e.g., Levitin et al., 1986, Feldstein and Levitin, 1986, Papitashvili et al., 1994, and references therein].

The IZMEM model does not require collection of in situ ground-based geomagnetic data for the event under investigation or selection of a magnetically quiet period to calculate geomagnetic disturbances. These distinguish the IZMEM from other similar algorithms such as the ''magnetogram inversion technique'' (TIM) developed at SibIZMIR, Irkutsk [Mishin et al., 1980], the well-known KRM method [Kamide et al., 1981], and the AMIE technique [Richmond and Kamide, 1988].

In 1999, the IZMEM model was recalibrated utilizing the DMSP electrostatic potentials - IZMEM/DMSP [Papitashvili et al., 1999]. This effort has been undertaken in colaboration with Dr. Frederick J. Rich (Air Force Reseacrh Laboratory, Hanscom AFB, Mass.) and Dr. Marc R. Hairston (University of Texas at Dallas).

Recently we applied the LiMIE approach to the DMSP electrostatic potentials and, therefore, constructed a new, DMSP-based Ionospheric Convection Model (DICM) [Papitashvili and Rich, 2001]. This model is similar to the DE2-based model of ionospheric convection [Weimer, 2001a, and references therein], but DICM is fully parameterized by the IMF strength and direction.

Then we applied the LiMIE approach to the Ørsted/Magsat high-precision magnetic measurements and constructed a new, IMF-dependent model of field-aligned currents distributions over the polar regions [Papitashvili et al., 2001]. This model is similar to the DE2-based FAC model [Weimer, 2001b].

If any questions or comments about this technique arise, please contact Dr. Vladimir O. Papitashvili, Space Physics Research Laboratory, The University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109-2143 (E-mail: papita at umich.edu)

This work is partially supported by the National Science Foundation awards OPP-9614175 and ATM-9727554. The DICM development was undertaken under the NRC/AFOSR Summer Faculty Fellowships.



References


Last Update: August 25, 2006 (VP)

Copyright © 1995-2006 by Vladimir Papitashvili. All rights reserved.