A study of GPS ionospheric scintillations observed at Guilin |
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| Authors: | Yuhua Zou Dongli Wang |
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| Institution: | 1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;2. Beijing Key Laboratory of Space Environment, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;3. Space Science Laboratory, University of Massachusetts Lowell, MA 01854, USA;4. University of Chinese Academy of Sciences, Beijing 100049, China;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, University of Lagos, Yaba, Lagos, Nigeria;2. Department of Physical Sciences, Chrisland University, Owode, Abeokuta, Nigeria;1. Electrical and Electronic Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK;2. Positioneering Ltd., Aberdeen AB12 3BR, UK;1. Ethiopian Space Science and Technology Institute, Department of Space Science and Application, Addis Ababa, Ethiopia;2. Bule Hora University, College of Natural and Computational Science, Department of Physics, Bule Hora, Ethiopia;3. South Africa National Space Agency, Space Science, Hermanus, South Africa;4. Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa;5. Washera Geospace and Radar Science Laboratory, Physics Department, Bahir Dar University, Bahir Dar, Ethiopia;1. Universidade do Vale do Paraíba – UNIVAP, Laboratório de Física e Astronomia, Av. Shishima Hifumi 2911, CEP 12244-000, São José dos Campos, SP, Brazil;2. Instituto Federal de Tocantins - IFTO, Observatório de Física Espacial, Campus Araguatins, Rua Castelo Branco, Povoado Santa Teresa - Km 05, CEP 77950-000, TO, Brazil;3. Center for Atmospheric and Space Sciences, Utah State University, Logan, UT, USA;4. Instituto Nacional de Pesquisas Espaciais – INPE, Av. dos Astronautas 1758, CEP 12227-010, São José dos Campos, SP, Brazil |
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| Abstract: | The occurrence of strong ionospheric scintillations with S4≥0.2 was studied using global positioning system (GPS) measurements at Guilin (25.29°N, 110.33°E; geomagnetic: 15.04°N, 181.98°E), a station located near the northern crest of equatorial anomaly in China. The results are presented for data collected from January 2007 to December 2008. The results show that amplitude scintillations occurred only during the first five months of the considered years. Nighttime amplitude scintillations, observed mainly in the south of Guilin, always occurred with phase scintillations, total electron content (TEC) depletions, and Rate Of change of TEC (ROT) fluctuations. However, TEC depletions and ROT fluctuations were weak during daytime amplitude scintillations, and daytime amplitude scintillations usually occurred in most of the azimuth directions. GPS scintillation/TEC observations recorded at Guilin and signal-to-noise-ratio measurements obtained from GPS-COSMIC radio occultation indicate that nighttime and daytime scintillations are very likely caused by ionospheric F region irregularities and sporadic E, respectively. |
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