A correlative study of magnetic flux transfer in the magnetosphere

Physics

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Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Flux, Transport Properties, Correlation Coefficients, Geomagnetic Tail, Ogo-5, Satellite Observation, Solar Terrestrial Interactions

Scientific paper

The applied magnetic flux of the southward component of the IMF in GSM coordinates (Bz-) which impinges upon the sunward magnetopause is compared to the time integral of the auroral AL index during 56 intervals within a 3-month period in 1969 when interplanetary records from Heos 1 and Explorer 35 were available. The periods of magnetic activity were those for which Bz was greater than 0 and AL was less than 20gamma at the beginning and end of the interval. It was found that for these intervals, the time integral of the AL index was proportional to the applied magnetic flux with a correlation coefficient of 0.94. In addition, the empirical relationships between magnetic flux transfer, applied southward flux, and the time integral of AL arrived at by Holzer and Slavin (1978) on the basis of expansion and contractions of the forward magnetosphere observed with OGO 5 are reexamined and improved.

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