Variation and modeling of ultraviolet auroral oval boundaries associated with interplanetary and geomagnetic parameters
Variation and modeling of ultraviolet auroral oval boundaries associated with interplanetary and geomagnetic parameters
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与行星际和地磁参数相关的紫外线极光椭圆边界的变化和建模
DOI：
10.1002/2016sw001530
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发表时间：
2017-04
期刊：
影响因子：
--
通讯作者：
Yang Hui-Gen
中科院分区：
文献类型：
--
作者：
Hu Ze-Jun;Yang Qiu-Ju;Liang Ji-Min;Hu Hong-Qiao;Zhang Bei-Chen;Yang Hui-Gen
利用极紫外成像仪采集的6万多幅图像自动识别的大型极光极/赤道边界数据集，研究了与行星际/地磁环境和磁层动力学参数相关的极光边界变化。从数据集中共确定了3,805,000/1,215,000个极/赤道边界点。研究发现，随着Kan - Lee电场的增大，极/赤道边界向赤道方向移动。夜侧扇区（1800-0600磁地方时（MLT））的极/赤道边界随着IMF By值的增大和南北电场的增大呈赤道运动。赤道边界（1800 ~ 0300 MLT）随太阳风动压和速度的增加呈准线性赤道位移。随着声发射指数的增加，极向边界（不包括正午扇区）和赤道边界向赤道方向扩展。利用多元回归方法建立了以IMF、太阳风速度和密度、声发射为输入参数的极光椭圆边界模型。对模型的评价表明，当输入参数在有效值覆盖范围内（IMF的三个分量分别为- 8 ~ +8 nT，太阳风速度、密度和声发射分别不超过550 km/s、20/cm - 3和520 nT）时，模型在极地边界和赤道边界的平均绝对偏差分别为1.3 ~ 2.1°磁纬（MLAT）和1.3 ~ 2.5°MLAT。
A large data set of auroral poleward/equatorward boundary, which are automatically identified from more than 60,000 images acquired by Polar ultraviolet imager, is used to study the variation of auroral boundaries associated with the interplanetary/geomagnetic environments and dynamic parameters of the magnetosphere. A total number of 3,805,000/1,215,000 points for poleward/equatorward boundary were identified from the data set. It is found that the poleward/equatorward boundaries show an equatorward movement with the increase of Kan‐Lee electric field. The poleward/equatorward boundaries in the nightside sector (1800–0600 magnetic local time (MLT)) show an equatorward motion with the increase of the value of IMF By and the north‐south electric field. The equatorward boundary (1800–0300 MLT) shows a quasi‐linear equatorward displacement with the increase of solar wind dynamic pressure and speed. The poleward boundary (excluding midday sector) and equatorward boundary expand equatorward with the increase of AE index. The auroral oval boundary model with input parameters of the three components of IMF, solar wind speed and density, and AE is developed by using multivariate regression method. Evaluation of the model shows that the mean absolute deviation of the model in every MLT sector is 1.3–2.1° magnetic latitude (MLAT) for the poleward boundary and 1.3–2.5° MLAT for the equatorward boundary, respectively, when input parameters are within valid value coverage (three components of IMF are each from −8 to +8 nT, and the values of solar wind speed and density, and AE are not more than 550 km/s, 20/cm−3, and 520 nT, respectively).
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影响因子：
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作者：
P. Newell;T. Sotirelis;K. Liou;C. Meng;F. Rich
通讯作者：
P. Newell;T. Sotirelis;K. Liou;C. Meng;F. Rich
影响因子：
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作者：
M. Brittnacher;M. Fillingim;G. Parks;J. Spann
通讯作者：
M. Brittnacher;M. Fillingim;G. Parks;J. Spann
影响因子：
1.9
作者：
P. Boakes;S. Milan;G. Abel;M. Freeman;G. Chisham;B. Hubert;T. Sotirelis
通讯作者：
P. Boakes;S. Milan;G. Abel;M. Freeman;G. Chisham;B. Hubert;T. Sotirelis
行星际磁场和太阳风对不同地区极光亮度的影响
影响因子：
2.8
作者：
Yang, Y. F.;Lu, J. Y.;Wang, J. -S.;Peng, Z.;Zhou, L.
通讯作者：
Zhou, L.
影响因子：
--
作者：
D. Hardy;W. J. Burke;M. Gussenhoven;N. Heinemann;E. Holeman
通讯作者：
D. Hardy;W. J. Burke;M. Gussenhoven;N. Heinemann;E. Holeman