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• W219312306 abstract "A fleld mill (FM) has been permanently operated at a distance of about 170m from the Gaisberg Tower (GBT) in Austria since several years. The electric fleld measurements sufier from fleld enhancement due to its location on a 4-m tall metal platform near the tower which itself is located on a 1280 meter high mountain. A special measuring campaign was conducted to determine the fair-weather atmospheric electric fleld at the Gaisberg Mountain on June 24th, 2010. The main objectives of this campaign were to calibrate the fleld mill in order to infer the relation between the electric flelds at the tower tip and the ground level measured by the fleld mill under thunderstorm conditions. Besides the permanent fleld mill near the tower, two Campbell Scientiflc CS100 electric fleld meters were used during this campaign, and distances between each other were determined by using the Global Positioning System (GPS). Overall we determined an enhancement factor of 2.75 due to the mountain itself with reference to the mountains surrounding terrain. A fleld enhancement factor of 7.81 was obtained for the permanently installed fleld mill at the measurement platform next to the GBT with reference to the undisturbed electric fleld at the mountain top close to the platform at ground level. The electric fleld near the tower (distances about the tower height of 100m) was smaller than the fleld measured at larger distance from the Tower. This observation was possibly caused by a shadowing efiect of the tower. The amplitude of fair-weather atmospheric electric fleld is usually of the order of one to two hundred Volts per meter (1,2). It can be measured by a fleld mill on ∞at ground. If the fleld mill is mounted above the ground or installed at elevated objects, it will sufier from fleld enhancement. On the other hand, if the fleld mill is located close to tall objects (i.e., buildings, big trees, towers), the fleld mill reading will be lower due to the shadowing efiect of these objects. Electric fleld enhancement factors at the top of buildings with difierent heights for lightning radiated flelds are reported in the range of 1.5 to 2.3 compared with the measurements at ground level (3{6). Next to the Gaisberg Tower (GBT) in Austria, a fleld mill (FM) is permanently operated since several years. The main purpose of those electric fleld measurements is to determine the background electric fleld that exists right at the time when upward lightning is triggered by the 100 m high tower. This radio tower on the mountain triggers about 60 upward initiated lightning ∞ashes per year and is instrumented in order to measure the lightning current waveforms (7). Knowledge of the background electric fleld at the mountain top will allow the estimation of the local electric fleld at the tower top by using a flnite element model of the tower structure. The FM is mounted on a 4-m tall metal platform at a distance of about 170m from the GBT and hence the electric fleld measurements sufier from fleld enhancement. In order to get an approximate correction factor, simultaneous measurements are necessary. Besides the permanent fleld mill, a reference fleld mill is needed. In this paper, we report the results of measured atmospheric electric flelds under fair weather conditions at the Gaisberg Mountain in Austria. The enhancement factors due to the mountain itself and the elevated metal platform are investigated. Also the shadowing efiect of the 100-m radio tower on the fair-weather electric fleld is presented." @default.
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• W219312306 date "2011-01-01" @default.
• W219312306 modified "2023-09-27" @default.
• W219312306 title "Fair-weather atmospheric electric field measurements at the Gaisberg Mountain in Austria" @default.
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