Modeling the spatial structure of the high latitude magnetic perturbations and the related current systems

Details Modeling the spatial structure of the high latitude magnetic perturbations and the related current systems Modeling the spatial structure of the high latitude magnetic perturbations and the related current systems

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phpl....6.4185v&link_type=abstract

Physics of Plasmas, Volume 6, Issue 11, pp. 4185-4194 (1999).

Physics

15

Ionospheric Disturbances, Irregularities, And Storms, Magnetic Storms, Substorms, Time Series Analysis, Multivariate Analysis

Scientific paper

Previous input-output analysis of the electrojet indices has been generalized to a spatio-temporal dynamical model of the high latitude magnetic perturbation (HLMP) by using the spatially dependent measurements that can be provided by a ground magnetometer array of latitudinal coverage. A technique that utilizes the daily rotation of the Earth as a longitudinal, or local time, sampling mechanism is used to construct a two-dimensional representation of the high latitude magnetic perturbations, both in magnetic latitude and local time, from the single latitudinal chain of magnetometers. Two-dimensional static, linear dynamical and nonlinear dynamical models for the evolution of the spatial structure of the HLMP are constructed by including a coupling to the solar wind as the energy input. The nonlinear spatial model of the HLMP produces better predictions than the linear one, reducing the average error from 65 to 50 nT for the Hx component. This can be taken as an indication that during intense activity, the HLMP and related current system evolves in a nonlinear fashion.

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