HF Doppler observations of 23 October, 1976 total solar eclipse over south-eastern Australia |
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| Affiliation: | 1. College of Engineering and Science, Victoria University, PO Box 14428, Melbourne, VIC 8001, Australia;2. Institute for Sustainability and Innovation, Victoria University, PO Box 14428, Melbourne, VIC 8001, Australia;3. Aquamem Scientific Consultants, Rodeo, NM 88056, USA;4. South Australian Water Corporation, Adelaide, SA 5000, Australia;1. Department of Mechanical and Mechatronics Engineering, University of Waterloo 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;2. Institute for Combustion and Gas Dynamics (IVG), Fluid Dynamics University of Duisburg-Essen, 47047 Duisburg, Germany;1. Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, the Netherlands;;2. Diagnostic and Research Center for Molecular BioMedicine, Medical University of Graz, Graz, Austria;3. School of Health Sciences & Social Work, Biomedical Sciences, Carinthia University of Applied Sciences, Klagenfurt, Austria;4. Sub-Department of Environmental Technology, Wageningen University, Wageningen, the Netherlands;5. Institute of Physical and Theoretical Chemistry, Graz University of Technology, Graz, Austria;6. Institute of Hydraulics and Rural Water Management, University of Natural Resources and Life Sciences, Vienna, Austria;7. Optical Sciences group, Faculty of Science and Technology, University of Twente. Twente. the Netherlands |
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| Abstract: | Observations of the Doppler shift of HF transmissions on 2.5 MHz and 4.5 MHz propagated via the ionosphere during the 23 October, 1976 eclipse over south-eastern Australia are reported. The 4.5 MHz signal, reflected from the F-region, showed the characteristic frequency shift attributable to recombination and/or motion of the reflection height after first contact. Spreading of the Doppler signal occurred after totality. Some wave activity was present in the record which is normal for this time of day. The 2.5 MHz observations showed little activity up to totality when sporadic E conditions set in, masking the detection of the response of the normal E-region to the eclipse. |
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