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arXiv 0903.4344astro-ph.SR
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首次确定日冕物质抛射的真实质量:一种使用两个STEREO观点的新方法

First Determination of the True Mass of Coronal Mass Ejections: A Novel Approach to Using the Two STEREO Viewpoints

Robin C. Colaninno, Angelos Vourlidas

摘要:

日地关系天文台(STEREO)的两个日地连接日冕和日光层调查(SECCHI)COR 2日冕仪提供了从太阳系两个视点拍摄的日冕图像。自2006年底发射以来,STEREO Ahead(A)和Behind(B)航天器一直以每年22.5度的速度缓慢地与地球分离。到2007年底,这两个航天器彼此之间的距离超过40度。在这个时候,我们开始看到在STEREO-A和B上用SECCHI-COR 2观测到的日冕物质抛射(CME)在形态和总强度上的大规模差异。由于汤姆逊散射几何的影响,观测到的日冕物质抛射的强度取决于它与观测到的天空平面所成的角度。从强度图像中,我们可以计算综合视线电子密度和质量。我们证明,是可能的,同时获得的方向和真正的总质量的日冕物质抛射,如果我们作出简单的假设,相同的质量应在COR 2-A和B。

英文摘要:

The twin Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) COR2 coronagraphs of the Solar Terrestrial Relations Observatory (STEREO) provide images of the solar corona from two view points in the solar system. Since their launch in late 2006, the STEREO Ahead (A) and Behind (B) spacecrafts have been slowly separating from Earth at a rate of 22.5 degrees per year. By the end of 2007, the two spacecraft were separated by more than 40 degrees from each other. At this time, we began to see large-scale differences in the morphology and total intensity between coronal mass ejections (CMEs) observed with SECCHI-COR2 on STEREO-A and B. Due to the effects of the Thomson scattering geometry, the intensity of an observed CME is dependent on the angle it makes with the observed plane of the sky. From the intensity images, we can calculate the integrated line of sight electron density and mass. We demonstrate that is is possible to simultaneously derive the direction and true total mass of the CME if we make the simple assumption that the same mass should be observed in COR2-A and B.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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