摘要： Effects of intense geomagnetic storms (Dst index < −100) to low latitude F region irregularities in the post‐sunset hours are statistically studied by the total electron content (TEC) phase fluctuation observations obtained from the ground‐based global positioning system (GPS) receivers in the Brazilian longitude sector during a 7.5‐year period of 1 April 1998–31 October 2005. Results show that the low latitude irregularities are significantly suppressed during the main and recovery phases of the intense geomagnetic storms in the months (September–March) that normally have high irregularity activity. In contrast, the post‐sunset triggering signatures are pronounced in the low irregularity activity season (April–August) during storms. To further understand the storm‐produced behaviors in the low latitude F region irregularity in the post‐sunset hours, the relationship between the intensity of GPS phase fluctuations and the occurrence time of the of IMF Bz turnings is examined and discussed. Key Points A statistical study of GPS phase fluctuations during magnetic storms The suppression of Fp in high irregularity activity seasons The triggering of Fp in low irregularity activity seasons 其他題名： J. Geophys. Res 出版者： Washington, DC: Blackwell Publishing Ltd 出版日期： 2012-03 出處： Journal of Geophysical Research Atmospheres, 2012-03, Vol.117 (A3), p.n/a 資源來源： Wiley Online Library - AutoHoldings Journals 版權： Copyright 2012 by the American Geophysical Union 版權： 2015 INIST-CNRS 識別號： ISSN: 0148-0227 識別號： ISSN: 2169-9380 識別號： ISSN: 2156-2202 識別號： EISSN: 2156-2202 識別號： EISSN: 2169-9402 識別號： DOI: 10.1029/2011JA017419
