Modulation of Solar Wind Impact on the Earth's Magnetosphere during the Solar Cycle

被引:1
作者
Carbone, Francesco [1 ]
Telloni, Daniele [2 ]
Yordanova, Emiliya [3 ]
Sorriso-Valvo, Luca [3 ,4 ]
机构
[1] Univ Calabria, Natl Res Council, Inst Atmospher Pollut Res, I-87036 Arcavacata Di Rende, Italy
[2] Natl Inst Astrophys Astrophys Observ Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy
[3] Swedish Inst Space Phys, Angstrom Lab, Lagerhyddsvagen 1, SE-75121 Uppsala, Sweden
[4] CNR, Ist Sci & Tecnol Plasmi, Via Amendola 112-D, I-70126 Bari, Italy
关键词
magnetohydrodynamics; solar wind; magnetosphere; heliosphere; SCIENCE; GUIDE;
D O I
10.3390/universe8060330
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The understanding of extreme geomagnetic storms is one of the key issues in space weather. Such phenomena have been receiving increasing attention, especially with the aim of forecasting strong geomagnetic storms generated by high-energy solar events since they can severely perturb the near-Earth space environment. Here, the disturbance storm time index Dst, a crucial geomagnetic activity proxy for Sun-Earth interactions, is analyzed as a function of the energy carried by different solar wind streams. To determine the solar cycle activity influence on Dst, a 12-year dataset was split into sub-periods of maximum and minimum solar activity. Solar wind energy and geomagnetic activity were closely correlated for both periods of activity. Slow wind streams had negligible effects on Earth regardless of their energy, while high-speed streams may induce severe geomagnetic storming depending on the energy (kinetic or magnetic) carried by the flow. The difference between the two periods may be related to the higher rate of geo-effective events during the maximum activity, where coronal mass ejections represent the most energetic and geo-effective driver. During the minimum period, despite a lower rate of high energetic events, a moderate disturbance in the Dst index can be induced.
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页数:10
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