Prompt derivation of TEC from GEONET data for space weather monitoring in Japan |
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| Institution: | 1. National Time Service Center, Chinese Academy of Sciences, Xi’an, Shaanxi 710600, China;2. Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi’an, Shaanxi 710600, China;3. Xi’an Institute of Optics and Precision Mechanics, Xi’an, Shaanxi 710119, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Space Science and Technology (ISST), University of Karachi, Karachi 75270, Pakistan;2. Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;3. Virtual University, M.A. Jinnah Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan;1. ESSO-National Centre for Antarctic & Ocean Research, Headland Sada, Vasco da Gama, Goa, India;2. Indian Institute of Geomagnetism, Kalamboli Highway, New Panvel (W), Navi Mumbai, India;1. North China University of Water Resources and Electric Power, Zhengzhou, China;2. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, 181 Chatham Road South, Hung Hom, Kowloon 999077, Hong Kong, China;3. State Key Laboratory of Geodesy and Earth''s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China |
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| Abstract: | Continuous monitoring of ionospheric conditions is essential to monitoring and forecasting space weather. The worldwide use of global navigation satellite systems like the Gobal Positioning System (GPS) makes it possible to continuously monitor the total electron content (TEC) of the ionosphere and plasmasphere up to a height of about 20,000 km. We have developed a system for deriving the TEC from GEONET data rapidly and we use the TEC distribution over Japan in the daily operations of the Space Weather Forecast Center at NICT (RWC Tokyo of ISES). Using instrumental biases from a few days before enables us to drastically shorten the processing time for deriving TEC. The latest TEC values (with a delay of about 1 h) are obtained every 3 h, and most of the values are within 2 TEC units of the actual TEC. We have found our system for deriving TEC rapidly to be useful for continuously monitoring the progress of ionospheric storms under any ionospheric conditions, even those under which the usual ionosonde observations are unable to obtain F-region profiles. |
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