| 缓变型太阳高能粒子事件特征时间及其经向分布 |
| |
| 引用本文： | 丁留贯,曹鑫鑫,王智伟,顾斌.缓变型太阳高能粒子事件特征时间及其经向分布[J].空间科学学报,2018,38(3):296-306. |
| |
| 作者姓名： | 丁留贯 曹鑫鑫 王智伟 顾斌 |
| |
| 作者单位： | 1 南京信息工程大学空间天气研究所 南京 210044; |
| |
| 基金项目： | 国家自然科学基金项目（U1731105，41304150），江苏省基础研究计划面上项目（BK20171456）和江苏省教育厅"青蓝工程"人才项目共同资助 |
| |
| 摘 要： | 利用SOHO，STEREO高能粒子观测数据，对2011-2014年30个通量短时间内显著增强的缓变型太阳高能粒子（SEP）事件的两个特征时间（局地爆发时间，起始释放时间）及其经向分布进行统计分析.研究结果显示，多颗卫星同时观测到的SEP事件伴随的日冕物质抛射（CME）角宽明显较一般事件大，且基本都为Halo CME；不同卫星观测到的粒子通量局地增强时间差与卫星位置经度差明显线性正相关且东西不对称；局地爆发时间和起始释放时间相对于耀斑时间的延迟与卫星相对经度正相关；卫星所有能量通道的两个特征时间极差与卫星相对经度呈现较好的正相关，这表明不同能量SEP释放的时间跨度具有明显经度差异；高低能释放时间差与CME速度正相关.这些结论表明，SEP事件的两个特征时间具有明显的经向依赖性，并都与CME速度相关.
|
| 关 键 词： | 太阳高能粒子事件 特征时间 经向分布 日冕物质抛射 |
| 收稿时间： | 2017-04-21 |
Characteristic Times and Longitudinal Distributions of Gradual Solar Energetic Particle Events |
| |
| Affiliation: | 1 Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing 210044;2 School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044 |
| |
| Abstract: | The two characteristic times (onset time tob and release time tsr) and their longitudinal distribution of 30 gradual Solar Energetic Particle (SEP) events from 2011 to 2014, which particle flux increase remarkably in a short time, are analyzed. The results show that the SEP events observed by multi-spacecraft are usually associated with the wider halo Coronal Mass Ejection (CME) than those of general SEP events. The onset time difference of energetic particles observed by two spacecraft presents a good linear correlation with the longitude difference of two spacecraft, and east-west hemispheric asymmetry. The time intervals between the onset and release time and the flare onset are positively correlated with the relative longitude of the detector to the active region. The range of onset time or release time (tslow-tfast) in different energy channels for one SEP event shows a good positive correlation with the relative longitude of spacecraft, and release time ranges in different energy channels have a distinct longitudinal distribution. The release time interval between high and low energy channel has a positive correlation with CME speed. Therefore, the two characteristic times, in-situ onset time and solar particle release time near the sun, have obvious longitudinal distributions, and a strong correlation with the associated CME. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《空间科学学报》浏览原始摘要信息 |
|
点击此处可从《空间科学学报》下载全文 |
