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PCI References
Copyright WDC C1 for STP at RAL.
Further Reading :
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Troshichev, O.A., V.G. Andrezen, S. Vennerstrom, E. Friis-
Christensen, Magnetic activity in the polar cap - A new index,
Planet. Space Sci., 36, 1095-1102, 1988.
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Vennerstroem, S., E. Friis-Christensen, O.A. Troshichev, V.G.
Andrezen, Comparison between the Polar Cap Index, PC, and the
Auroral Electrojet Indices, AE, AL, and AU, J. Geophys. Res.,
96, 101-113, 1991.
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Vennerstroem, S., E. Friis-Christensen, O.A. Troshichev and V.G.Andrezen,
Geomagnetic polar cap index 1975-1993, Report UAG-103, WDC A for
Solar-Terrestrial Physics, NGDC, Boulder.
The Thule PCI is derived by
WDC-C1 for Geomagnetism,
Copenhagen.