The configuration of the auroral distribution for interplanetary magnetic field Bz northward: 1. IMF Bx and By dependencies as observed by the Viking satellite
The configuration of the auroral distribution for interplanetary magnetic field Bz northward: 1. IMF Bx and By dependencies as observed by the Viking satellite
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向北行星际磁场 Bz 的极光分布配置： 1. Viking 卫星观测到的 IMF Bx 和 By 依赖关系
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
L. Cogger
中科院分区：
文献类型：
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作者：
R. Elphinstone;K. Jankowska;J. Murphree;L. Cogger
1986 年获得的维京图像与 IMP 8 卫星对行星际磁场 (IMF) 的测量相结合，以确定各种 IMF Bz 正条件下的典型北半球极光分布。 Varying By 的效果与预期结果一致。也就是说，By 正数表示黄昏区的高纬度极光弧，而负 By 则表示黎明区的极弧。新结果对 IMF 的 Bx 部分给予了高度重视。 Bx 朝向太阳 (By = 0) 在黎明和黄昏时给出极弧，紫外线发射相对较弱。当 Bx 远离太阳（By = 0）时，单个与太阳对齐的早晨扇区极弧主导了极光分布。 IMF 方位角仅 45° 的变化似乎会影响时间尺度小于 2-3 小时的全球极光分布。发现极光的极向边界对 IMF 方位角有很强的依赖性，该方位角根据所研究的磁本地时间而变化。
Viking images obtained throughout 1986 have been utilized in combination with IMP 8 satellite measurements of the interplanetary magnetic fields (IMF) to determine typical northern hemisphere auroral distributions for a variety of IMF Bz positive conditions. Varying By has an effect which is consistent with expected results. That is, By positive implies high-latitude auroral arcs in the dusk sector while negative By gives dawn sector polar arcs. A new result gives significant importance to the Bx component of the IMF. Bx toward the Sun (By = 0) gives polar arcs on both dawn and dusk with comparatively weak UV emissions. With Bx away from the Sun (By = 0) a single Sun-aligned morning sector polar arc dominates the auroral distribution. Azimuthal angle changes to the IMF of only 45° seem to affect the global auroral distribution with time scales of less than 2–3 hours. Poleward boundaries of the aurora were found to have a strong dependence on the IMF azimuthal angle which varied according to the magnetic local time investigated.