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Statistical comparison of the ICME's geoeffectiveness of different types and different solar phases from 1995 to 2014
Author(s) -
Shen Chenglong,
Chi Yutian,
Wang Yuming,
Xu Mengjiao,
Wang Shui
Publication year - 2017
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja023768
Subject(s) - coronal mass ejection , geomagnetic storm , space weather , solar cycle 23 , interplanetary spaceflight , solar cycle 24 , earth's magnetic field , physics , solar wind , geophysics , atmospheric sciences , astrophysics , magnetic field , quantum mechanics
The geoeffectiveness of interplanetary coronal mass ejections (ICMEs) is an important issue in space weather research and forecasting. Based on the ICME catalog that we recently established and the D s t indices from the World Data Center, we study and compare the geoeffectiveness of ICMEs of different in situ signatures and different solar phases from 1995 to 2014. According to different in situ signatures, all ICMEs are divided into three types: isolated ICMEs (I‐ICMEs), multiple ICMEs (M‐ICMEs), and shock‐embedded ICMEs (S‐ICMEs), resulting in a total of 363 group events. The main findings of this work are as follows: (1) Fifty‐eight percent of ICMEs caused geomagnetic storms with D s t min ≤−30 nT. Further, large fraction (87%) of intense geomagnetic storms are caused by ICME groups and their sheath regions. (2) Numbers of ICME groups and the probabilities of ICME groups in causing geomagnetic storms varied in pace with the solar cycle. Meanwhile, the ICME groups and the probabilities of them in causing geomagnetic storms in Solar Cycle 24 are much lower than those in Solar Cycle 23. (3) The maximum value of the intensity of the magnetic field ( B ), south component of the magnetic field ( B s ), and dawn‐dusk electric field v B s are well correlated with the intensity of the magnetic storms. (4) Shock‐embedded ICMEs have a high probability in causing geomagnetic storms, especially intense geomagnetic storms. (5) The compression of shock on the south component of magnetic field is an important factor to enhance the geoeffectiveness of S‐ICMEs structures.