Anomalous modification of the ionospheric total electron content prior to the 26 September 2005 Peru earthquake |
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| Affiliation: | 1. West Department of IZMIRAN, 236010 Kaliningrad, Russian Federation;2. Institute of Geodesy, University of Warmia and Mazury, Olsztyn, Poland;1. University of Rennes 1, Rennes, France;2. Institute of Atmospheric Physics of ASCR, Prague, Czech Republic;3. Instituto Nazionale di Geofisica e Vulcanologia, Rome, Italy;4. National Central University, Jungli City, Taiwan;1. School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China;2. Department of Earth and Enviormental Sciences, Bahria University, Islamabad, Pakistan;3. School of Mathematics and Information Science, Wenzhou University, Wenzhou 325035, China;1. Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory, Moscow 119991, Russia;2. Institute of Solar-Terrestrial Physics SB RAS, Lermontova Str. 126a, Irkutsk 664033, Russia;3. Irkutsk State University, Gagarin bvd. 20, Irkutsk 664000, Russia;1. Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263129, India;2. School of EEE, Nanyang Technological University, Singapore 639798, Singapore;3. Atmospheric Research Lab., Department of Physics, Banaras Hindu University, Varanasi 221005, India;4. Dept. of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea |
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| Abstract: | This paper investigates the features of pre-earthquake ionospheric anomalies in the total electron content (TEC) data obtained on the basis of regular GPS observations from the International GNSS Service (IGS) network. For the analysis of the ionospheric effects of the 26 September 2005 Peru earthquake, Global Ionospheric Maps (GIMs) of TEC were used. The possible influence of the earthquake preparation processes on the main low-latitude ionosphere peculiarity—the equatorial anomaly—is discussed. Analysis of the TEC maps has shown that modification of the equatorial anomaly occurred a few days before the earthquake. In previous days, during the evening and night hours (local time—LT), a specific transformation of the TEC distribution had taken place. This modification took the shape of a double-crest structure with a trough near the epicenter, though usually in this time the restored normal latitudinal distribution with a maximum near the magnetic equator is observed. Additional measurements (CHAMP satellite) have also confirmed the presence of this structure. To compare the vertical TEC measurements obtained with GPS satellite signals (GPS TEC), the International Reference Ionosphere, IRI-2001, was used for calculating the IRI TEC. |
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