极光

Auroral electrojet index is usually used to quantitatively describe the activity of the geomagnetic field in the polar region.

极光电集流指数被广泛用来定量描述由电离层电流引起的极光带地磁活动。

The distribution characteristic of auroral electrojet in AZS, is helpful for the studies of F layer and magnetosphere coupling in polar region and aurora dynamics.

了解了极光电集流在南极中山站的分布特征，有利于极区电离层和磁层耦合及极光动力学的研究。

"Magnetic tail" of the earth. Eventually those field lines "break" and snap back

光。 极光是在这"最后面的闭合磁线"底下发生，这解释极光是椭圆形。

AURORA Matouqin Orchestra is different from other music team that they promote their own music discs (manufactured by Beijing Tianyishengshi international culture media AURORA Orchestra) by mise en scene, meanwhile, they also plan and participate in culture communications and

极光乐团不同于一般的艺术表演团体，其主旨是以舞台演出的形式大力推广由乐团演奏录制、北京天一盛世国际文化传媒极光音乐机构出品的音乐碟片，同时也策划、参与一些文化交流活动与商业性演出。

AURORA Matouqin Orchestra is different from other music team that they promote their own music discs (manufactured by Beijing Tianyishengshi international culture media AURORA Orchestra) by mise en scene, meanwhile, they also plan and participate in culture communications and business performs.

极光乐团不同于一般的艺术表演团体，其主旨是以舞台演出的形式大力推广由乐团演奏录制、北京天一盛世国际文化传媒极光音乐机构出品的音乐碟片，同时也策划、参与一些文化交流活动与商业性演出。

Multiple wavelengths characteristics of dayside aurora activities were investigated with these keograms and in reference to all-sky images. It was found that there are three repeatedly appearing aurora activity regions along the dayside aurora oval. They are, Region A around 0900MLT in which aurora moves poleward while its intensity decreasing, and its form changingfrom arc to corona with time; Region B around 1330MLT in which aurora moves equatorward while its intensity increasing, and its form changing from corona to arc in time; Region C around 1330MLT in which aurora expands poleward while its intensity decreasing, and its forma evolving from arc to multiple arcs in time. There is a narrow belt of aurora activity in North-South direction between Regions A and B, which is dominated by weak and red corona aurora.

初步分析发现，沿日侧极光卵不论磁静日还是磁扰日，在三个波段上都同时观测到了四个重复出现的极光活动区，即0900MLT附近的A区、1330MLT的B区和1630MLT的C区以及1200MLT附近的G区。A区内的极光活动由低纬向高纬运动，强度逐渐变弱，形态由较宽的弧状极光向冕状极光演变；B区内的极光活动由高纬向低纬方向运动，形态呈现为冕状极光向较窄的极光弧的演变，极光强度逐渐增强；C区极光活动向高纬方向展宽，强度逐渐变弱，极光由单弧向多重弧演化；而在A与B之间存在一个纬度范围相对较窄的极光活动区G区，该区的极光呈现暗弱的冕状极光。

The results show that the occurrence of postnoon multiple arcs demonstrates a single peak distribution, and the maximum peak is at 1445 UT (1645 MLT) and the position lies to the nightside part of "1500 MLT hot spot"(1300-1700 MLT).

本文利用2001-2003年南极中山站175天全天空摄像机观测，对午后多重极光弧的出现率及其与Kp指数的关系进行了统计分析，结果表明午后多重极光弧出现率呈一单峰分布，最大发生率出现在1445UT(1645MLT)，其位置在1500MLT极光热点(1300-1700MLT)近夜侧的部分。

Auroras are also called the northern polar lights as it is only visible in the north sky from the northern hemisphere.

极光也称为北部极光，因为它只能在北方天空从北半球。

Our current ideas on what forms Saturn's aurorae predict that this region should be empty, so finding such a bright one here is a fantastic surprise.

根据目前有关土星极光形成的观点，我们预测该地区应该是空荡荡的，因此在这里发现如此明亮的极光是大大出乎意料的。

The corona type aurora mainly occurs at polarward and overhead of Zhongshan Station during postnoon and around midnight. The band type aurora mainly appears during postnoon, while during evening and around midnight only appears at equatorward.

冕状极光主要出现在子夜附近和午后的极向侧和天顶，在傍晚出现很少；带状极光主要出现在午后和赤道侧的傍晚与子夜；极光浪涌主要出现在子夜前后；向日极光弧则主要出现在子夜前后，子夜前比子夜后多，极向和天顶比赤道侧多。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。