日侧极光弧发射强度与沉淀电子能谱的相关性

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS 地球物理学报 Pub Date : 2017-01-01 DOI:10.1002/CJG2.30023
Qiu Qi, Y. Huigen, Lu Quan-Ming, Huang Ze-jun
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引用次数: 6

摘要

对557.7和630.0 nm发射强度的2万多个日侧极光弧进行了统计研究,确定了I557.7/I630.0比值与I557.7发射强度的依赖关系。557.7 nm发射强度在热点区和暖斑区有两个最大值,平均值分别为2.2 kR和2.9 kR。630.0 nm发射强度在磁午线附近有最大值,平均为1.5 kR,在I557.7 0.1~10 kR发射范围内,I557.7/I630.0比值有从0.2增大到9的趋势。利用中国北极黄河站(YRS)上空经过40个极光弧的17次DMSP观测,研究了发射强度与沉淀电子能谱的相关性。我们得到了电子的平均能量与I557.7/I630.0比值成正比的方程。电子的总能量通量与I557.7的发射强度呈正相关。观测到极光弧的典型电子沉淀区域是午前和午后扇区的边界等离子体片(BPS)。我们还发现了一些来自地幔区域的低能沉淀电子,这些弧位于日光侧极光椭圆的极地。低能沉降电子的磁源区确定为临近磁午时的低纬度边界层。在这个地区,弧位于低纬度。
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CORRELATION BETWEEN EMISSION INTENSITIES IN DAYSIDE AURORAL ARCS AND PRECIPITATING ELECTRON SPECTRA
More than 20000 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 emission intensity and precipitating electron spectra has been investigated using 17 cases of DMSP passing through 40 auroral arcs above 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, where the auroral arcs were observed, was the boundary plasma sheet (BPS) 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 low latitude boundary layer (LLBL) adjacent to magnetic noon. Arcs are located in the lower latitude in this region.
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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