Impacts of ionospheric electric fields on the GPS tropospheric delays during geomagnetic storms in Antarctica

[摘要] This paper aimed to overview the interaction of the thunderstorm with the ionospheric electric fields during major geomagnetic storms in Antarctica through the GPS tropospheric delays. For the purpose of study, geomagnetic activity and electric fields data for the period from 13 to 21 March 2015 representing the St. Patrick's Day storm is analyzed. To strengthen the analysis, data for the period of 27 October to 1stNovember 2003 representing for the Halloween storm is also compared. Our analysis showed that both geomagnetic storms were severe (Ap ≥ 100 nT), where the intensity of Halloween storm is double compared to St. Patrick's Day storm. For the ionospheric electric field, the peaks were dropped to -1.63 mV/m and -2.564 mV/m for St. Patrick and Halloween storms, respectively. At this time, the interplanetary magnetic field Bz component was significantly dropped to -17.31 nT with Ap > 150 nT (17 March 2015 at 19:20 UT) and -26.51 nT with Ap = 300 nT (29 October 2003 at 19:40 UT). For both geomagnetic storms, the electric field was correlated well with the ionospheric activity where tropospheric delays show a different characteristic.

[发布机构] Space Science Centre (ANGKASA), Institute of Climate Change, Universiti Kebangsaan Malaysia, Bangi, Selangor Darul Ehsan; 43600, Malaysia^1

[效力级别] 无线电电子学

[关键词] Antarctica;Geomagnetic activities;Geomagnetic storm;Halloween storms;Interplanetary magnetic fields;Ionospheric activity;Ionospheric electric fields;Tropospheric delays