Synoptic models of high latitude magnetic activity and equivalent ionospheric and induced currents

Details Synoptic models of high latitude magnetic activity and equivalent ionospheric and induced currents Synoptic models of high latitude magnetic activity and equivalent ionospheric and induced currents

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1435w&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1435-1452.

Physics

4

Scientific paper

Hourly models of the northern high latitude magnetic activity and the equivalent ionospheric and induced currents have been made for the entire 1980 period using data from 55 magnetic observatories. Vector observations and the method of spherical cap harmonic analysis are used to simultaneously model the external and internal scalar potentials from which the disturbance vector field and the corresponding equivalent currents can be determined anywhere and at anytime on, over and under the cap. This modelling technique, when used with observatory mean hourly values to reduce spatial aliasing of irregular disturbances and with the quiet nighttime (undisturbed) reference level, provides reasonable synoptic (basic) models (errors 5-80 nT). Only the statistically significant coefficients are retained in the hourly models so those for a full year (8784 models) can be readily stored and used on small computer systems. However, there are numerous regions that are in need of observatories and such additional data could significantly improve the delineation of large irregular disturbances. These synoptic models of the high latitude disturbance fields and the equivalent currents have a variety of applications. The models of the disturbance field might be used for correcting some magnetic surveys for the temporal variations, for the analyses of the large scale equivalent ionospheric and induced current systems and for determining parameters of the activity. Maps of the external currents provide an indication of their spatial extent and, with other observations, can be used to study the electrodynamics and the heating of the upper atmosphere and the magnetosphere-ionosphere coupling. Similarly, maps of the induced currents show their spatial extent, variability and the influences of the conducting oceans and other crustal features. Timely data and models of the activity could be used to help mitigate the effects of active conditions on surveys and also the hazardous effects of storms on some technological facilities.

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