Details

Autor(en) / Beteiligte

• Le, Gui-Ming
• Zhao, Ming-Xian
• Zhang, Wen-Tao
• Liu, Gui-Ang

Titel

Source Locations and Solar-Cycle Distribution of the Major Geomagnetic Storms (Dst≤−100 nT) from 1932 to 2018

Ist Teil von

• Solar physics, 2021-12, Vol.296 (12), Article 187

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We studied the source locations and solar-cycle (SC) distribution of the major geomagnetic storms (MGSs) that occurred from 1932 to 2018. We divided the MGSs into two groups: the intense geomagnetic storms (IGSs) ( − 200 nT < Dst ≤ − 100 nT ) and the great geomagnetic storms (GGSs) ( Dst ≤ − 200  nT). The GGSs were split into three subgroups: GGSs-I ( − 300 nT < Dst ≤ − 200 nT ), GGSs-II ( − 400 nT < Dst ≤ − 300 nT ) and GGSs-III ( − 600 nT < Dst ≤ − 400 nT ). The source locations of the GGSs-I and GGSs-II were distributed in the longitudinal range of [E84, W73], while the GGSs-III were distributed in the range of [E22, W14]. 90% of the GGSs were distributed in the longitudinal area of [E45, W45]. The statistical results show that 38.6%, 61.4% and 86% of the GGSs occurred in the ascending phase, the descending phase, and the period from two years before to three years after the solar maximum, respectively. 33.3%, 66.7% and 76% of the IGSs appeared in the ascending phase, the descending phase, and the period from two years to three years after the solar maximum, respectively. The number of MGSs in a SC has a good correlation with the SC size. However, the largest storm intensity in a SC has almost no relationship with the SC size, implying that the number of MGSs in a weak SC will be small. However, we cannot rule out the possibility that a weak SC may have a very strong extreme geomagnetic storm.