Effects of geomagnetic storm on GPS ionospheric scintillations at Sanya |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Institute of Space Science, National Central University, Chung-Li, Taiwan;3. Space Environment Research Center, Kyushu University, Japan;1. CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India;2. Academy of Scientific and Innovative Research (AcSIR), CSIR-HRDC Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh 201002, India;3. Frederick Research Center, Nicosia, Cyprus;4. Department of Electrical Engineering, Computer Engineering and Informatics, Frederick University, Nicosia, Cyprus;5. Department of ECE, KL Deemed to be University, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, Andhra Pradesh 522302, India;1. Centre for Space and Remote Sensing Research, National Central University, Taoyuan City 32001, Taiwan;2. Centre for Atmospheric Research, University of Massachusetts Lowell, Lowell, MA 01854, USA;3. Air Force Research Laboratory, Space Vehicle Directorate, Kirtland AFB, NM 87123, USA;4. Institute for Scientific Research, Boston College, Boston, MA 02467, USA;1. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India;2. Department of Electronics and Communication Engineering, Tripura University, Agartala 799022, India |
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| Abstract: | The effects of geomagnetic storm on GPS ionospheric scintillations are studied here using GPS scintillation data recorded at Sanya (18.3°N, 109.5°E; geomagnetic: 7.6°N, 180.8°E), the southmost station in the Chinese longitude region. GPS scintillation/TEC and DMSP data are utilized to show the development of irregularities during the period year 2005 (solar minimum). Statistical analysis of K planetary index (Kp) and amplitude scintillation index (S4) indicates that most storms of the year did not trigger the scintillation occurrence at Sanya. However, cases of scintillation occurring during moderate and strong storm (Dst<?100) periods show clearly that the development of irregularities producing scintillations can be triggered by geomagnetic storms during the low scintillation occurrence season. The effects (trigger or not trigger/inhibit) depend on the maximum dDst/dt determined local time sector, and can be explained by the response of the equatorial vertical drift velocities to magnetospheric and ionospheric disturbance electric fields. For station Sanya, the maximum dDst/dt determined local time is near the noon (or post-midnight) sector for most storms of the year 2005, which inhibited (or did not trigger) the post-sunset (or post-midnight) scintillation occurrence and then led to the phenomena that the statistical results presented. |
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