2009年7月22日日全食的日冕结构

发布时间：2018-05-21 01:06

本文选题：日全食 + 日冕　；参考：《科学通报》2010年14期

【摘要】：日冕是太阳的外层大气,其高温等离子体外流而形成太阳风,又发射很强的紫外和X射线辐射,日冕活动严重地影响日地空间环境.日冕结构与太阳活动有密切联系.2009年7月22日发生21世纪最壮观的日全食,是观测研究日冕的良机,但由于全食带地区大多阴雨而受挫,幸好在个别天气好的地方可拍摄到高质量的日冕数码像.本文选取其中部分像,进行数字图像处理,结合SOHO卫星LASCOC2所观测的当天的外冕图像进行分析,揭示日冕的一些结构,得到日冕两极和赤道的亮度径向平滑分布.2009年是第24个太阳活动周期的开始年,虽然太阳活动水平仍较低,但比去年的极小期活跃得多,日冕结构有较明显的变化,不仅显示赤道区比两极区延展,即使东西赤道区和南北极区也有较大差别.赤道东侧的冕流,尤其赤道北的大冕流很显著,南极区比北极区的冕羽由更多的极射线组成.日冕赤道区和极区的亮度径向分布接近于去年的太阳活动极小,但赤道东西方向的亮度分布差别较去年小,南极与北极方向的差别也较小.这些日冕特征也显示在日冕等亮度图上.
[Abstract]:The corona is the outer atmosphere of the sun. Its high temperature plasma flows out to form the solar wind, and it emits very strong ultraviolet and X-ray radiation. The coronal activity seriously affects the solar-terrestrial space environment. The coronal structure is closely related to solar activity. The most spectacular total solar eclipse of the 21st century, which occurred on July 22, 2009, is a good opportunity to observe the corona, but is thwarted by most of the overcast rain in the total eclipse zone. Fortunately, high-quality digital images of the corona can be taken in some good weather places. In this paper, some of the images are selected for digital image processing, and the coronal images observed by SOHO satellite LASCOC2 on the day of the day are analyzed to reveal some of the coronal structures. The radial smooth distribution of the brightness of the polar and equatorial coronal is obtained. 2009 is the beginning year of the 24th solar active cycle. Although the solar activity level is still low, it is much more active than the minimum period of last year, and the coronal structure has obvious changes. It not only shows that the equatorial region extends more than the polar region, but also the east-west equatorial region is different from the arctic region. The coronal current on the east side of the equator, especially the coronal current in the north of the equator, is remarkable. The coronal plume in the Antarctic region is composed of more polar rays than in the Arctic region. The radial distribution of luminance in the equatorial and polar regions of the coronal is close to the minimum solar activity of last year, but the difference in the east-west direction of the equator is smaller than that in the last year, and the difference in the direction of the Antarctic and the Arctic is also smaller. These coronal features are also shown on the isochromatic chart of the corona.
【作者单位】：南京大学天文系;
【基金】：中国科学院知识创新工程方向性项目资助(KJCX2-YW-T13)
【分类号】：P125.11;P182.62

【共引文献】