EISCAT observations of large scale electron temperture and electron density perturbations caused by high power HF radio waves |
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| Institution: | 1. Department of Physics and Astronomy, Leicester University, LE1 7RH, U.K.;2. Max-Planck Institute for Aeronomy, Lindau, F.R.G.;1. Laboratoire de Physique des Oceans, UMR 6523, CNRS/IFREMER/IRD/UBO, Brest, France;2. ICEMASA, Department of Oceanography, University of Cape Town, South Africa;3. CNRS-CERFACS, Toulouse, France;1. Holistic Electronics Research Laboratory, Department of Electrical and Computer Engineering, EMPHASIS Research Centre, University of Cyprus, Nicosia, Cyprus;2. Department of Electrical & Electronic Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom;1. II. Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany;2. GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany;1. Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), SUPARCO Rd, P. O. Box No. 8402, Karachi 75270, Pakistan;2. University of Karachi, Main University Rd, Karachi 75270, Pakistan |
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| Abstract: | In this paper EISCAT observations of the effect of artificial modification on the F-region electron temperature and electron density during several heating experiments at Tromsø are reported. During O-mode heating at full power (ERP = 240 MW) the electron temperature is increased by up to 55% of its ambient value at altitudes close to the heater interaction height. Measurements of the electron density have revealed both enhancements and depletions in the vicinity of the heater reflection height. These differences are indicative of variations in the balance between the transport and chemical effects. These results are compared with a time dependent numerical model developed from the perturbation equations of Vas'kov and Gurevich (1975) Geomagn. Aeron.15, 51]. The results of numerical modelling of the electron temperature are in good agreement with the EISCAT observations, whereas there is less good agreement with regard to electron density. |
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