Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4747r&link_type=abstract
Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4747-4750.
Physics
2
Geomagnetism, Interplanetary Magnetic Fields, Magnetic Measurement, Polar Caps, Polarity, Earth Magnetosphere, Magnetic Variations, Monte Carlo Method, Solar Activity Effects
Scientific paper
The effect of geomagnetic activity on indices of interplanetary magnetic polarity compiled for the years 1970-1972 (Svalgaar) and 1972 (Heckman; Mansurov) from polar cap magnetograms is assessed. The success rate of the indices is examined, and the average geomagnetic activity for incorrectly inferred toward and away days is compared with the average geomagnetic activity for known toward and away days. In 1972 the success rate for inferring toward days approaches the maximum expected (84-89%); the success rate for away days is 3-7% lower. The toward days incorrectly supposed to have away polarity have an average activity index 20% lower than average toward days; no significant geomagnetic bias was found in incorrectly inferred away days. It is concluded that for many statistical studies inferences of interplanetary polarity using polar cap magnetograms are adequate substitutes for in situ observations.
Fleming B. K.
Fougere Paul F.
Russell Christopher T.
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