Latitudinal and vertical parameters of the equatorial electrojet from an autonomous data set |
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| Institution: | 1. The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy;2. Institute for Radio Astronomy, National Academy of Science of Ukraine, Kharkiv, Ukraine;1. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;2. Dr. K. S. Krishnan Geomagnetic Research Laboratory, IIG, Near Chaman Ganj, Jhunsi, Allahabad 221505, India;1. Arctic and Antarctic Research Institute, 38, Bering Street, St. Petersburg 199397, Russia;2. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK;3. EISCAT Scientific Association, Kiruna SE-961 28, Sweden |
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| Abstract: | The magnetic field expressions from the current ribbon and thick current versions of the continuous distribution of current density model and their merits have been presented. For the first time both the latitudinal and vertical parameters of the equatorial electrojet (EEJ) have been derived from the same set of data. The local noon and daytime means of certain key parameters of the EEJ are shown to be in good agreement with those from other sources. Selected local noon means include: peak current density jo, 10.58 ± 0.34 A/km2; peak current intensity jo, 224 ± 9 A/km; total eastward current I+, 74 ± 5 kA ; EEJ current focal distance w, 300 ± 5 km ; half thickness at half of peak current density p, 7.0 ± 0.1 km; peak westward current location xm, 5.13 ± 0.08° dip latitude; and EEJ latitudinal extent L1, 12 ± 1° dip latitude. The problem of model calculated landmark distances of EEJ being consistently shorter than observations, encountered by Onwumechiliet al. J. geomagn. Geoelecl. 41, 443 (1989)] has been solved. |
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