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The fastest solar wind in 50 years.

The fastest solar wind in 50 years

Even though there were no spacecraft aloft during much of the last 50 years to measure the sun's continuous outpouring of ionized particles, or solar wind, scientists have established the date and rate of the highest solar wind over the past half-century: 7.8 million kilometers per second on Aug. 4, 1972. E. W. Cliver, of the geophysics laboratory at Hanscom Air Force Base, Mass., and J. Feynman and H. B. Garrett of Jet Propulsion Laboratory in Pasadena, Calif., calculated this record by comparing ground-measured delays between solar flares and the turbulence (geomagnetic storms) they cause in Earth's magnetic field. The researchers report the finding in the Oct. 1 JOURNAL OF GEOPHYSICAL RESEARCH.
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Title Annotation:in 1972
Publication:Science News
Date:Oct 20, 1990
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