Ionospheric response to the 17 March and 22 June 2015 geomagnetic storms over Wuhan region using GNSS-based tomographic technique |
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| Authors: | Jian Feng Yufeng Zhou Yan Zhou Shuaihe Gao Chen Zhou Qiong Tang Yi Liu |
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| Institution: | 1. China Research Institute of Radiowave Propagation, Qingdao, China;2. Beijing Institute of Applied Meteorology, Beijing, China;3. Unit 78127 of PLA, Chengdu, China;4. National Time Service Center, Chinese Academy of Science, China;5. Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan, China |
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| Abstract: | By using the data of GNSS (Global Navigation Satellite System) observation from Crustal Movement Observation Network of China (CMONOC), ionospheric electron density (IED) distributions reconstructed by using computerized ionospheric tomography (CIT) technique are used to investigate the ionospheric storm effects over Wuhan region during 17 March and 22 June 2015 geomagnetic storm periods. F-region critical frequency (foF2) at Wuhan ionosonde station shows an obvious decrease during recovery phase of the St. Patrick’s Day geomagnetic storm. Moreover, tomographic results present that the decrease in electron density begins at 12:00 UT on 17 March during the storm main phase. Also, foF2 shows a long-lasting negative storm effect during the recovery phase of the 22 June 2015 geomagnetic storm. Electron density chromatography presents the evident decrease during the storm day in accordance with the ionosonde observation. These ionospheric negative storm effects are probably associated with changes of chemical composition, PPEF and DDEF from high latitudes. |
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| Keywords: | Ionospheric electron density distributions Multiplication algebraic reconstruction technique Ionospheric storm effects |
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