| 日侧极光弧的发光强度与沉降电子能谱的相关关系 |
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| 引用本文： | 丘琪,杨惠根,陆全明,胡泽骏.日侧极光弧的发光强度与沉降电子能谱的相关关系[J].地球物理学报,2017,60(2):489-498. |
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| 作者姓名： | 丘琪 杨惠根 陆全明 胡泽骏 |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学学院, 中国科学院近地空间环境重点实验室, 合肥 230026;2. 中国极地研究中心国家海洋局极地科学重点实验室, 上海 200136 |
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| 基金项目： | 国家自然科学基金重点项目（41431072）和面上项目（41274164，41504115），南北极环境综合考察与评估专项（CHINARE2016-02-03，CHINARE2016-04-01），中国科学院战略性先导科技专项（XDA04060201），浦东新区科技发展基金（Pkj2013-z01），国家海洋局极地科学重点实验室开放基金（KP201303）和中组部青年拔尖人才计划项目共同资助. |
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| 摘 要： | 本文利用中国北极黄河站多波段全天空极光观测数据,选取稳定的日侧极光弧,统计研究了极光强度比I_(557.7)/I_(630.0)与极光发光强度I_(557.7)的相关关系.发现I_(557.7)在午前暖点和午后热点区附近出现极大值,分别为2.2kR和2.9 kR;而I_(630.0)在磁正午出现极大值,为1.5kR.当I_(557.7)从0.1kR增加到10kR时,极光强度比I_(557.7)/I_(630.0)也由0.2增加到9.结合DMSP卫星探测的沉降粒子能谱数据,找到17个DMSP卫星穿越黄河站上空极光弧的事件,共穿越40条极光弧.得到了沉降电子的平均能量正比于极光强度比I_(557.7)/I_(630.0),沉降电子的总能通量正相关于极光强度I_(557.7)的关系式.利用该关系式反演所有极光弧的电子能谱,发现在午前和午后扇区,产生极光弧的沉降电子主要来源于等离子体片边界层;在高纬出现强度较弱的弧,对应等离子体幔区域.在磁正午附近,沉降电子的平均能量较低,极光弧处于低纬一侧,粒子源区主要是低纬边界层.
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| 关 键 词： | 日侧极光弧 极光发光强度 电子沉降 等离子体片边界层 低纬边界层 |
| 收稿时间： | 2016-04-27 |
Correlation between emission intensities in dayside auroral arcs and precipitating electron spectra |
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| QIU Qi,YANG Hui-Gen,LU Quan-Ming,HU Ze-Jun.Correlation between emission intensities in dayside auroral arcs and precipitating electron spectra[J].Chinese Journal of Geophysics,2017,60(2):489-498. |
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| Authors: | QIU Qi YANG Hui-Gen LU Quan-Ming HU Ze-Jun |
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| Institution: | 1. CAS Key Laboratory of Geoscience Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 230026, China;2. SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China |
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| Abstract: | More than 20,000 dayside auroral arcs of the 557.7 and 630.0 nm emission intensities have been statistically studied, and the dependences of the I557.7/I630.0 ratio on the I557.7 emission intensity have been determined. The 557.7 nm emission intensity has two maximum values in the hot spot and warm spot regions, with average values of 2.2 and 2.9 kR, respectively. But there is a maximum near magnetic noon for 630.0 nm emission intensity, with an average value of 1.5 kR. In the I557.7 emission range 0.1~10 kR, the I557.7/I630.0 ratio tends to increase from 0.2 to 9. The correlation between the emission intensity and precipitating electron spectra have been investigated using 17 cases of DMSP passing through 40 auroral arcs above the Chinese Arctic Yellow River Station (YRS). We obtain the equations that the average energy of the electrons is proportional to the I557.7/I630.0 ratio. There is a positive correlation between the total energy flux of the electrons and the I557.7 emission intensity. The typical region of electron precipitation, which the auroral arcs were observed, was BPS (boundary plasma sheet) in the prenoon and postnoon sectors. We also found some low-energy precipitating electrons from the region of mantle, where the arcs are located poleward of dayside auroral oval. The magnetic source region of the precipitating electrons with low energy was identified as the LLBL (low latitude boundary layer) adjacent to magnetic noon. Arcs are located at the lower latitude in this region. |
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| Keywords: | Dayside auroral arc Auroral emission intensity Electron precipitation BPS LLBL |
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