Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..817r&link_type=abstract
(International Symposium on Equatorial Astronomy - II, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrest
Astronomy and Astrophysics
Astronomy
27
Backscattering, Electric Fields, Equatorial Electrojet, Ionospheric Disturbances, Magnetic Storms, Radar Measurement, Ionospheric Currents, Magnetospheric Instability, Solar Wind, Space Plasmas, Sudden Storm Commencements
Scientific paper
The mean Doppler frequency values of the VHF backscatter signals from the equatorial electrojet's type II plasma irregularities, which are a measure of the driving electric field in the electrojet, are used to delineate the complex time variations of the electrojet electric field and current during the geomagnetic storms of Apr. 25 and Sept. 18, 1979. An empirical method is used to estimate the ionospheric and magnetospheric current distributions to the Thumba storm-time surface magnetic field perturbations. It is concluded that the daytime sudden storm commencement-related increases in the horizontal component of the geomagnetic field at electrojet latitudes have a large contribution from an impulsive charge of electrojet electric field during the commencement. During the initial phase, both magnetospheric and electrojet currents exhibit rapid fluctuations which are in antiphase.
Chandrasekhar Reddy A.
Somayajulu V. V.
Viswanathan Sankaran K.
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