Global scale equatorial ionization anomaly (EIA) response to magnetospheric disturbances based on the May-June 1987 SUNDIAL-coordinated observations

Details Global scale equatorial ionization anomaly (EIA) response to magnetospheric disturbances based on the May-June 1987 SUNDIAL-coordinated observations Global scale equatorial ionization anomaly (EIA) response to magnetospheric disturbances based on the May-June 1987 SUNDIAL-coordinated observations

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..585a&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 7, p. 585-594.

Physics

9

Atmospheric Ionization, Equatorial Electrojet, F Region, Magnetospheric Instability, Electric Fields, Ionosondes, Ring Currents

Scientific paper

Equatorial ionization anomaly (EIA) responses to magnetospheric disturbances have been investigated using ionosonde and geomagnetic data sets obtained for different longitude sectors during the 9-day (28 May-7 June) globally-coordinated SUNDIAL 87 campaign. Attention is focused on the EIA response features of the two magnetically most-disturbed days of the campaign window, 29 May and 6 June. Anomalous EIA inhibition and development were simultaneously observed at widely separated (American and Asian) longitude sectors, accompanied respectively by events of morning electrojet reversal and evening partial ring current development. A numerical model of the low-latitude ionosphere has been used to quantify the role that a disturbance electric field could play in the observed EIA response features. The implications of the results on the global low-latitude disturbance electric field pattern is discussed.

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