The Vertical Structure of Dynamo Winds Deduced from Geomagnetic Variations Associated with Solar Flares

by Stanley Marshall Greenfield, S. V. Venkateswaran


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A detailed time analysis of the massive solar flare that occurred at 1522 UT on 28 August 1966 and a study of its implications for the large-scale wind system in the 90-140 km dynamo region of the atmosphere. Equivalent ionospheric current maps for the flare-produced part of the magnetic variation were constructed to cover every 2.5 minutes from 1522 to 1602 UT. Results support the assumption that the massive X-ray output was at first mainly in the longer wavelengths which were absorbed in the lower E or F regions. The X-radiation became progressively harder as the flare reached maximum, then softened. Analysis of the sequence of observed sudden ionospheric disturbances indicates the existence of vertical variation in the global wind systems in the dynamo region, resulting in a reversal of current in the upper part of the region.

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