On the equatorial electrojet influence on geomagnetic pulsation amplitudes |
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| Institution: | 1. U.S. Geological Survey, Box 25046, MS 964, Denver Federal Center, Denver, CO 80225-0046, USA;2. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Centre for Exploration Targeting, School of Earth and Geographical Sciences, University of Western Australia, Crawley, Western Australia 60094, Australia;4. Orebusters Py Ltd, 4 Handley Close, Leeming, WA 6149, Australia |
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| Abstract: | It is well known that several types of geomagnetic pulsations show a significant amplitude enhancement near the dip equator due to the daytime equatorial electrojet. In the present study, the dependence of this enhancement on the period and type of geomagnetic variations is examined. The results show that, in general, the amplitude enhancement appears to be more or less uniform, amounting to a factor of 2.0–2.5, over a wide range of periods. However, for pulsations, there is a fairly sharp cut-off of the equatorial enhancement around a 20 s period, the shorter period end of Pc3 pulsations. Further, shorter period pulsations (<20 s) sometimes suffer an attenuation at the dip equator near noon. These results are discussed in the light of the transmission characteristics of the ionosphere, including the possible relation to the equatorial anomaly in the ionospheric F-region. |
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