The Spatial and Temporal Characteristics of Pc3 Geomagnetic Activity over Canada in 2000, as a Guide to Planning the Times of Aeromagnetic Surveys |
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| Authors: | Marc A Vallée Larry Newitt Ian R Mann Mouhamed Moussaoui Régis Dumont Pierre Keating |
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| Institution: | (1) Fugro Airborne Surveys, 2191 Thurston Drive, Ottawa, ON, Canada, KIG 6C9;(2) Geomagnetic Laboratory, Geological Survey of Canada, 7 Observatory Crescent, Ottawa, ON, Canada, K1A 0Y3;(3) Space Physics Group, Dept. of Physics, University of Alberta, Edmonton, AB, Canada, T6G 2J1;(4) Fugro Airborne Surveys, 2191 Thurston Drive, Ottawa, ON, QC, Canada, KIG 6C9;(5) Geological Survey of Canada, 615 Booth Street, Ottawa, ON, Canada, K1A 0E9 |
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| Abstract: | Geomagnetic activity affects aeromagnetic surveys. Geomagnetic variations are quite complex and can be quantified in different
ways. A measure of geomagnetic activity that is useful for planning aeromagnetic surveys is the Pc3 pulsation index developed
by the Australian Space Weather Agency. Purposeful to developing guidelines for planning aeromagnetic surveys in Canada, we
study the variations in Pc3 index amplitude over Canada in 2000. This study shows distinct patterns associated with the sub-auroral
zone, the auroral zone, and the polar cap. Average Pc3 index activity is higher during the months of February, July, September,
and November in the auroral and sub-auroral zones. The station in the polar cap exhibits maximum activity near midday during
the summer months. Detailed analysis of a magnetic storm shows that Pc3 index amplitude during the beginning of the solar
storm is least important at the polar cap. The mean Pc3 index also relates to solar wind parameters such as the solar wind
velocity and the vertical polarity of the interplanetary magnetic field. Analysis of the morning maximum of the Pc3 index
observed in the auroral zone can be used to develop guidelines for planning aeromagnetic surveys in Canada and other areas
of the world affected by auroral zones. |
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| Keywords: | Aeromagnetic surveys geomagnetism pulsations geomagnetic storms |
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