Dynamo action in sporadic-E formation

Details Dynamo action in sporadic-E formation Dynamo action in sporadic-E formation

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..367j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, April 1987, p. 367-376.

Physics

4

Atmospheric Circulation, Atmospheric Electricity, Dynamo Theory, Sporadic E Layer, Wind (Meteorology), Atmospheric Models, Geomagnetism, Periodic Variations, Scale Height, Wind Shear

Scientific paper

A theoretical study of the effects of background winds on wind shear-produced sporadic-E layers requires an account of the dynamo electric fields which result from the plasma motion produced by these winds. When a sporadic-E layer is carried downward by a descending wind shear the final height of the layer may vary by some 10 km depending on the background wind. Due to a loading effect on the dynamo, for a given background wind, the final height may vary by about 6 km depending on the degree of ionization in the E-layer in the magnetically conjugate hemisphere. The time scale for dispersal of a sporadic-E layer by drifts in wind-induced electric fields may be as little as 2 h.

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