Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..915c&link_type=abstract
Geophysical Research Letters, vol. 8, Aug. 1981, p. 915-918. Research supported by the Max C. Fleischmann Foundation
Physics
83
Auroral Zones, Earth Magnetosphere, Geomagnetism, Interplanetary Magnetic Fields, Solar Terrestrial Interactions, Solar Wind Velocity, Computer Programs, Data Reduction, Least Squares Method, Linear Prediction, Low Pass Filters, Plasma Interactions
Scientific paper
Solar wind magnetosphere energy coupling functions are analyzed using linear prediction filtering with 2.5 minute data. The relationship of auroral zone geomagnetic activity to solar wind power input functions are examined, and a least squares prediction filter, or impulse response function is designed from the data. Computed impulse response functions are observed to have characteristics of a low pass filter with time delay. The AL index is found well related to solar wind energy functions, although the AU index shows a poor relationship. High frequency variations of auroral indices and substorm expansions are not predictable with solar wind information alone, suggesting influence by internal magnetospheric processes. Finally, the epsilon parameter shows a poorer relationship with auroral geomagnetic activity than a power parameter, having a VBs solar wind dependency.
Clauer Robert C.
Galland Kivelson Margaret
McPherron Robert L.
Searls C.
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