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On the high correlation between long-term averages of solar wind speed and geomagnetic activity
Author and Affiliation:
Crooker, N. U.(California, University, Los Angeles, Calif., United States);
Feynman, J.(High Altitude Observatory, Boulder, Colo., United States);
Gosling, J. T.(California, University, Los Alamos, N. Mex., United States)
Abstract: Six-month and yearly averages of solar-wind speed from 1962 to 1975 are shown to be highly correlated with geomagnetic activity as measured by averages of the Ap index. On the same time scale the correlation between the southward component of the interplanetary magnetic field and geomagnetic activity is poor. Previous studies with hourly averages gave opposite results. The better correlation with the southward component on an hourly time scale is explained by its large variation compared with the relatively constant solar-wind speed. However, on a yearly time scale the magnitude of the variations in both parameters are about the same. This problem can be solved by invoking an energy transfer mechanism which is proportional to the first power of the southward component and a higher power of the solar-wind speed.
Publication Date: May 01, 1977
Document ID:
19770051690
(Acquired Dec 01, 1995)
Accession Number: 77A34542
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research; 82; May 1
Publisher Information: United States
Contract/Grant/Task Num: NSF ATM-75-22346
Financial Sponsor: NASA; United States
Organization Source: California Univ.; Los Angeles, CA, United States
Los Alamos Scientific Lab.; NM, United States
National Center for Atmospheric Research; Boulder, CO, United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GEOMAGNETISM; INTERPLANETARY MAGNETIC FIELDS; SOLAR ACTIVITY EFFECTS; SOLAR WIND VELOCITY; CORRELATION; EARTH MAGNETOSPHERE; ENERGY TRANSFER; LONG TERM EFFECTS; MAGNETIC EFFECTS; SUNSPOT CYCLE; WIND VELOCITY MEASUREMENT
Imprint And Other Notes: Journal of Geophysical Research, vol. 82, May 1, 1977, p. 1933-1937. ERDA-NASA-sponsored research
Miscellaneous Notes: 1977, p. 1933-1937. ERDA-NASA-sponsored researc
Availability Source: Other Sources
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