ASTRA - Atmospheric & Space Technology Research Associates, LLC

Assimilative Mapping of Ionospheric Electrodynamics (AMIE)

The Assimilative Mapping of Ionospheric Electrodynamics (AMIE) model is an inversion technique that ingests data from a wide range of sources to produce a realistic representation of the high latitude electrodynamic state for a given time (Richmond and Kamide, 1988; Richmond, 1992). The data inputs typically include electric fields derived from ion velocities measured using radars and satellites, together with magnetic perturbations from ground- and space-based instruments. Using these data, the distribution of various electrodynamic parameters such as the electric potential and electric field can be derived through the electrodynamic equations. The AMIE code is run routinely at ASTRA on a 5-minute cadence, ingesting ground-based magnetometer, SuperDARN, and DMSP E-field data.

AMIE is used extensively at ASTRA for the following applications:

  • For space weather modeling with the TIME-GCM, AMIE provides high latitude inputs to the TIME-GCM by specifying the potential patterns and auroral particle precipitation every 5 minutes
  • AMIE velocity fields are used in 2-d patch trajectory analysis and in IDA4D
  • Field aligned current distributions from AMIE are used to understand magnetosphere-ionosphere coupling.
  • AMIE provides estimates of the polar cap electric potentials every 5 minutes for various studies
  • Understanding joule heating response to solar storms (with TIMEGCM)

ASTRA regularly provides AMIE outputs to the community and interested parties. For more information please feel free to contact us.

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