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基于T96模型的极尖区位形变化特性研究

ISSN号：0254-6124
期刊名称：空间科学学报
时间：0
页码：461-468
分类：P353[天文地球—空间物理学;天文地球—地球物理学]
作者机构：[1]中国科学院空间科学与应用研究中心空间天气学国家重点实验室,北京100190, [2]中国科学院研究生院,北京100049, [3]中国极地研究中心,上海200136
相关基金：国家自然科学基金项目（40921063,40974106,40831060）和科技部国家重点实验室专项经费共同资助
相关项目：空间天气基本物理过程和集成预报模式研究

关键词：极尖区, T96模型, 行星际扰动, Cusp, T96 model, Interplanetary disturbances

中文摘要：

基于T96模型，定义了极尖区的位形以及相关的描述参量（例如赤道向边界磁纬的最小值，纬向宽度，子午向和晨昏向的张角，倾斜度，扁平度，中心磁地方时等），讨论了太阳风动压（Pd）、行星际磁场（IMF）及磁暴强度对极尖区位形的影响．太阳风动压和磁暴强度越大，则极尖区的赤道向边界磁纬越小，纬向宽度越大，子午向和晨昏向的张角越大，倾斜度越大，扁平度越小；南向IMF Bz越强，则极尖区的赤道向边界磁纬越小，纬向宽度越小，子午向的张角越小，晨昏向的张角越大，倾斜度越大，扁平度越大；北向IMF By与南向IMF By的情况刚好相反；极尖区的中心磁地方时受IMF By控制，IMF By为正时，极尖区向昏侧移动，而IMF By为负时，极尖区则向晨侧移动，并且极尖区的中心磁地方时与IMF By之间有着良好的线性关系．将所得结果与前人的观测结果进行了简单比较，发现利用T96模型确定的极尖区位形与观测基本一致．

英文摘要：

Based on the T96 model, we obtained the topology of the Earth＇s cusp and defined some parameters （e.g., minimum magnetic latitude of the equatorial boundary, latitudinal width, flare angels in the meridian and terminator plane, inclination, flatness, central magnetic local time） to describe its configuration. The influences of the solar wind dynamic pressure, the interplanetary magnetic field and storm intensity on the cusp＇s configuration are further studied. As the increasing of the solar wind dynamic pressure and storm intensity, the cusp＇s minimum magnetic latitude of the equatorial boundary, inclination, and the flatness all decrease, while the latitudinal width and flareangles in the midnight-noon and dawn-dusk directions increase. With the increasing of southward IMF, the equatorial boundary, latitudinal width, flare angle in the midnight-noon direction and inclination all decrease, while the flare angle in the dawn-dusk direction and flatness both increase. However, the situations of northward IMF are contrary. The magnetic local time of the cusp is controlled by IMF By. When By is positive/negative, the cusp moves toward dusk/dawn side. And there is a good linear correlation between the magnetic local time and IMF By. By comparing to some former observational results, the cusp obtained from the T96 model is nearly in accordance with the observations.

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