Reconstruction of the ionospheric influence on ground-based observations of a short-duration ULF pulsation event

Details Reconstruction of the ionospheric influence on ground-based observations of a short-duration ULF pulsation event Reconstruction of the ionospheric influence on ground-based observations of a short-duration ULF pulsation event

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..801g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, Aug. 1988, p. 801-817. DFG-supported research.

Computer Science

18

Geomagnetic Micropulsations, Ionospheric Conductivity, Ionospheric Disturbances, Magnetohydrodynamic Stability, Electric Fields, Extremely Low Radio Frequencies, Field Aligned Currents, Incident Radiation, Radar Measurement

Scientific paper

Simultaneous observations of a Pc5 event in February 1977, made by the Scandinavian Magnetometer Array and the Scandinavian Twin Auroral Radar Experiment are analyzed to study the influence of the ionosphere on ULF pulsations. The spatial characteristics of the pulsation wave field using both sets of data were studied to allow for nonuniform conductivity in the model. A first-order approximation of the incident wave field was derived and used to compute the electric field of the reflected wave. The ground magnetic field is determined from ionospheric and field-aligned currents. Agreement between model ionospheric electric field and model ground magnetic fields and those observed is achieved by changing the conductivity and the incident electric field. The spatial variation of the ionospheric rotation angle was derived from the final model and was found to deviate significantly from the predicted 90 degree value.

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