A high time resolution study of interplanetary parameter correlations with AE

Details A high time resolution study of interplanetary parameter correlations with AE A high time resolution study of interplanetary parameter correlations with AE

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..179b&link_type=abstract

Geophysical Research Letters, vol. 8, Feb. 1981, p. 179-182. Research sponsored by the U.S. Department of Energy.

Physics

87

Auroral Electrojets, Data Correlation, Earth Magnetosphere, Interplanetary Magnetic Fields, Satellite Observation, Temporal Resolution, High Resolution, Magnetic Storms, Polar Substorms, Solar Activity Effects, Solar Wind Velocity

Scientific paper

The earth-orbiting spacecraft IMP-8 is used to carry out a high time-resolution (2.5 min) study of the linear cross-correlations of a quantitative indicator of magnetospheric substorm activity, the auroral electrojet (AE) index, with several interplanetary (IP) parameters. The investigation includes all available satellite data (from an eight-month period) rather than selecting a small number of substorm events, or a relatively small number of chosen days. This nonselective, high-resolution analysis reveals that VB sub s (V being the solar wind speed, and B sub s the southward component of the interplanetary magnetic field) generally reaches a higher peak correlation than the magnetospheric input parameter epsilon (0.6 vs 0.54). Both parameters are found to reach a peak correlation at the same lag time (with AE lagging the IP parameters by approximately 40 min), but it is noted that VB sub s also appears to have a preferable qualitative lag profile shape for AE prediction purposes.

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