Lower ionosphere effect observed during the 30 June 1992 total solar eclipse |
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| Affiliation: | 1. Dept. Electronics and Computer Technology, Faculty of Sciences, University of Granada, 18071 Granada, Spain;2. Infineon Technologies AG, 85579 Neubiberg, Germany;3. Infineon Technologies Austria AG, 9500 Villach, Austria;1. Institute of Refrigerant and Cryogenics, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China;1. Department of Anesthesiology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave B6/319 CSC, Madison, WI 53792-3727;2. University of Wisconsin School of Medicine and Public Health, Madison, WI;3. Department of Anesthesiology, University of Mississippi, Oxford, MS;1. Department of Psychology—University of Illinois at Chicago, Chicago, IL, USA;2. Department of Psychology—Brandeis University, Waltham, MA, USA;1. Fachbereich Mathematik, Universität Duisburg–Essen, 45117, Essen, Germany;2. School of Mathematics, University of Bristol, BS8 1TW, Bristol, UK;3. The Department of Mathematics and Statistics, Faculty of Science and Technology, UiT – The Arctic University of Norway, 9037 Troms, Norway;4. Heilbronn Institute for Mathematical Research, Bristol, UK |
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| Abstract: | VLF radio signals (12.9 kHz) transmitted from Ω-Argentina (43°12′S, 65°24′W) were received in Atibaia, Brazil (23°11 'S, 46°33'W) during the total solar eclipse of 30 June 1992. The surface path of the totality crossed the VLF propagation path in the sunrise transition period causing a phase delay of 6.4 μs and an amplitude change of 1.3 dB. The ionospheric response to the Sun's obscuration was compared with the phase delays reported for several solar eclipses that occurred from 1966 to 1979. The results are mainly discussed in terms of the length of VLF propagation path affected. Some similarities between a sudden phase anomaly and a reversed eclipse effect are also raised. |
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