The properties of solar active regions responsible for ground level enhancements during solar cycles 22 and 23  

作　　者：Gui-Ming Le Peng Li Hui-Gen Yang Yu-Lin Chen Xing-Xing Yang Zhi-Qiang Yin 

机构地区：[1]National Center for Space Weather, China Meteorological Administration [2]SOA Key Laboratory for Polar Science, Polar Research Institute of China [3]Nanjing University of Information Science & Technology [4]National Astronomical Observatories, Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2013年第10期1219-1224,共6页天文和天体物理学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 41074132, 41274193, 40931056 and 41031064);the National Basic Research Program of China (973 Program, Grant Nos. 2012CB957801 and 2011CB811406);the National Standard Research Program (Grant No. 10-123);the program SOA Key Laboratory for Polar Science, Polar Research Institute of China (Grant No. KP201206)

摘　　要：This is a study designed to analyze the relationship between ground level enhancements（GLEs）and their associated solar active regions during solar cycles 22and 23.Results show that 90.3%of the GLE events that are investigated are accompanied by X-class flares,and that 77.4%of the GLE events originate from super active regions.It is found that the intensity of a GLE event is strongly associated with the specific position of an active region where the GLE event occurs.As a consequence,the GLE events having a peak increase rate exceeding 50%occur in a longitudinal range from W20 to W100.Moreover,the largest GLE events occur in a heliographic longitude at roughly W60.Additionally,an analysis is made to understand the distributional pattern of the Carrington longitude of the active regions that have generated the GLE events.This is a study designed to analyze the relationship between ground level enhancements（GLEs）and their associated solar active regions during solar cycles 22and 23.Results show that 90.3%of the GLE events that are investigated are accompanied by X-class flares,and that 77.4%of the GLE events originate from super active regions.It is found that the intensity of a GLE event is strongly associated with the specific position of an active region where the GLE event occurs.As a consequence,the GLE events having a peak increase rate exceeding 50%occur in a longitudinal range from W20 to W100.Moreover,the largest GLE events occur in a heliographic longitude at roughly W60.Additionally,an analysis is made to understand the distributional pattern of the Carrington longitude of the active regions that have generated the GLE events.

关 键 词：Sun：particle emission Sun：flares Sun：sunspots 

分 类 号：P182.9[天文地球—天文学]