Response of equatorial ionosphere to the transit of interplanetary magnetic cloud of January 13-15, 1967 - Transient disturbance in F region

Details Response of equatorial ionosphere to the transit of interplanetary magnetic cloud of January 13-15, 1967 - Transient disturbance in F region Response of equatorial ionosphere to the transit of interplanetary magnetic cloud of January 13-15, 1967 - Transient disturbance in F region

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..519s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 4, April 1992, p. 519-534.

Computer Science

18

Equatorial Atmosphere, F Region, Interplanetary Magnetic Fields, Magnetic Clouds, Magnetic Storms, Chemical Effects, Electric Fields, Transient Response

Scientific paper

The response of the equatorial ionosphere to the severe geomagnetic storm associated with the transit of an interplanetary magnetic cloud at earth is evaluated using quarter-hourly ionograms of Kodaikanal. Data obtained indicate that during the early stage of the storm on January 13, a sudden downward drift of about 35.4 m/s occurred in the entire bottomside region, which lasted for about 2 h. An increase in electron density at and below the F layer peak accompanied the anomalous and rapid post-sunset descent of the F layer. The perturbation in the F region height near the dip Equator is interpreted as the signature of a transient westward electric field disturbance generated by the decrease in magnetospheric convection during the recovery phase of the substorm. The maximum amplitude of the westward electric fields is found to be about 1.9 mV/m. The increase in Nm is shown to be the outcome of the ionization convergence rate induced by the abnormally large downward drift exceeding the chemical loss rate at altitudes greater than or equal to 250 km.

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