EISCAT incoherent scatter radar observations and model studies of day to twilight variations in the D-region during the PCA event of August 1989 |
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| Institution: | 1. Environmental Process Modelling Centre (EPMC), Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological University, 1 CleanTech Loop, CleanTech One, #06-08, 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, N1-01c-98, 50 Nanyang Avenue, 639798, Singapore;3. 132 Rowley Laboratories, Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699-5710, USA |
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| Abstract: | An intense solar proton event causing enhanced ionization in the ionospheric D-region occurred on 12 August 1989. The event was partially observed during three successive nights by the EISCAT UHF incoherent scatter radar at Ramfjordmoen near Tromsa, Norway. Ion production rates calculated from GOES-7 satellite measurements of proton flux and a detailed ion chemistry model of the D-region are used together with the radar data to deduce electron concentration, negative ion to electron concentration ratio, mean ion mass and neutral temperature in the height region from 70 to 90 km, at selected times which correspond to the maximum and minimum solar elevations occurring during the radar observations. The quantitative interpretation of EISCAT data as physical parameters is discussed. The obtained temperature values are compared with nearly simultaneous temperature measurements at Andøya based on lidar technique. |
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