Evaluation of geomagnetic storm effects on the GPS derived Total Electron Content (TEC)

26th IUPAP Conference on Computational Physics

物理学;计算机科学

Purohit, P.K.^1 ; Mansoori, Azad A.^2 ; Khan, Parvaiz A.^2 ; Atulkar, Roshni^1 ; Bhawre, Purushottam^2 ; Tripathi, Sharad C.^2 ; Khatarkar, Prakash^2 ; Bhardwaj, Shivangi^2 ; Aslam, A.M.^2 ; Waheed, Malik A.^2 ; Gwal, A.K.^2

National Institute of Technical Teachers ' Training and Research, Bhopal

462002, India^1

Space Science Laboratory, Department of Physics, Barkatullah University, Bhopal

462026, India^2

关键词: Geomagnetic fields;    Geomagnetic storm;    Intense geomagnetic storms;    Interaction region;    Ionospheric disturbance;    Ionospheric total electron content;    Mid-latitude station;    Total electron content;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/640/1/012072/pdf
DOI  :  10.1088/1742-6596/640/1/012072

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The geomagnetic storm represents the most outstanding example of solar wind- magnetospheric interaction, which causes global disturbances in the geomagnetic field as well as triggers ionospheric disturbances. We study the behaviour of ionospheric Total Electron Content (TEC) during the geomagnetic storms. For this investigation we have selected 47 intense geomagnetic storms (Dst ≤ -100nT) that were observed during the solar cycle 23 i.e. during 1998- 2006. We then categorized these storms into four categories depending upon their solar sources like Magnetic Cloud (MC), Co-rotating Interaction Region (CIR), SH+ICME and SH+MC. We then studied the behaviour of ionospheric TEC at a mid latitude station Usuda (36.13N, 138.36E), Japan during these storm events produced by four different solar sources. During our study we found that the smooth variations in TEC are replaced by rapid fluctuations and the value of TEC is strongly enhanced during the time of these storms belonging to all the four categories. However, the greatest enhancements in TEC are produced during those geomagnetic storms which are either caused by Sheath driven Magnetic cloud (SH+MC) or Sheath driven ICME (SH+ICME). We also derived the correlation between the TEC enhancements produced during storms of each category with the minimum Dst. We found the strongest correlation exists for the SH+ICME category followed by SH+MC, MC and finally CIR. Since the most intense storms were either caused by SH+ICME or SH+MC while the least intense storms were caused by CIR, consequently the correlation was strongest with SH+ICME and SH+MC and least with CIR.