The equatorial enhancement of sudden commencements of geomagnetic storms

Details The equatorial enhancement of sudden commencements of geomagnetic storms The equatorial enhancement of sudden commencements of geomagnetic storms

May 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963jatp...25..267j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 25, no. 5, pp. 267-279

Physics

4

Scientific paper

A tentative theory is proposed for the well known enhancement of sudden commencements of geomagnetic storms near the magnetic equator. The principal idea is that the equatorial electrojet which has been invoked to explain the large amplitude of the quiet day daily variation in the (magnetic) equatorial regions is enhanced at the time of a sudden commencement (sc) of a geomagnetic storm. The westward electric field which is associated with the sc-variation of the geomagnetic field causes a downward movement of charged particles in the ionosphere which accumulate in the lower regions of the ionosphere. This yields an increase in the ionospheric electrical conductivity and accordingly in the intensity of the electrojet.

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