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solar cycle distribution of major geomagnetic storms

Research in Astronomy and Astrophysics 2013年第6期13卷 739-748页

作者： Gui-Ming Le Zi-Yu Cai Hua-Ning Wang Zhi-Qiang Yin Peng Li National Center for Space Weather China Meteorological Administration Key Laboratory of solar Activity National Astronomical Observatories Chinese Academy of Sciences Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education The Second High School Attached to Beijing Normal University Nanjing University of Information Science & Technology

We examine the solar cycle distribution of major geomagnetic storms （Dst ≤ -100 nT）, including intense storms at the level of -200 nT〈 Dst ≤ -100 nT, great storms at -300 nT〈 Dst ≤-200 nT, and super storms at Dst ≤ -300 nT, which occurred during the period of 1957-2006, based on Dst indices and smoothed monthly sunspot numbers. Statistics show that the majority （82%） of the geomagnetic storms at the level of Dst≤ -100 nT that occurred in the study pe- riod were intense geomagnetic storms, with 12.4% ranked as great storms and 5.6% as super storms. It is interesting to note that about 27% of the geomagnetic storms that occurred at all three intensity levels appeared in the ascending phase of a solar cycle, and about 73% in the descending one. Statistics also show that 76.9% of the intense storms, 79.6% of the great storms and 90.9% of the super storms occurred during the two years before a solar cycle reached its peak, or in the three years after it. The correlation between the size of a solar cycle and the percentage of major storms that occurred, during the period from two years prior to maximum to three years af- ter it, is investigated. Finally, the properties of the multi-peak distribution for major geomagnetic storms in each solar cycle is investigated.

关键词： Sun sunspots -- Sun activity -- Sun solar-terrestrial relations

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KuaFu Mission

引用

空间科学学报 2006年第Z1期26卷 25-29页

作者： XIA Lidong TU Chuanyi Schwenn Rainer Donovan Eric Marsch Eckart WANG Jingsong ZHANG Yongwei XIAO Zuo 无 School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Department of Geophysics Peking University Max-Planck-Institut für Sonnensystemforschung Katlenburg-LindauGermany Department of Physics and Astronomy University of CalgaryCalgaryCanada National Center for Space Weather Monitoring and Warning China Meteorological Administration Dong Fang Hong Satelite Co.Ltd China Academny of Space Technology Center for Space Science and Applied Research Chinese Academry of Sciences

The KuaFu mission-Space Storms,Aurora and Space Weather Explorer-is an"L1+Polar"triple satellite project composed of three spacecraft:KuaFu-A will be located at L1 and have instruments to observe solar EUV and FUV emissions,and white-light Coronal Mass Ejections(CMEs),and to measure radio waves,the local plasma and magnetic field,and high-energy ***1 and KuaFu-B2 will bein polar orbits chosen to facilitate continuous 24 hours a day observation of the north polar Aurora *** KuaFu mission is designed to observe the complete chain of disturbances from the solar atmosphere to geospace,including solar flares,CMEs,interplanetary clouds,shock waves,and their geo-effects,such as magnetospheric sub-storms and magnetic storms,and auroral *** mission may start at the next solar maximum(launch in about 2012),and with an initial mission lifetime of two to three *** data will be used for the scientific study of space weather phenomena,and will be used for space weather monitoring and forecast *** overall mission design,instrument complement,and incorporation of recent technologies will target new fundamental science,advance our understanding of the physical processes underlying space weather,and raise the standard of end-to-end monitoring of the Sun-Earth system.

关键词： KuaFu Mission Space weather solar-terrestrial relations

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