IPS and SMEI Analyses Using Tomographic 3-D Reconstructions

首席研究员（PI）开发了一种层析成像技术，该技术使用来自单个观测位置的多条视线的数据来重建日冕物质抛射和日光层中同向旋转等离子体结构的三维等离子体密度和速度分布。在这项工作中，PI将应用他的层析成像技术，使用日本日地环境实验室的实时日光层观测，太阳质量喷射成像仪（SMEI）航天器的白光观测，以及来自印度Ooty射电望远镜和墨西哥和俄罗斯其他观测站的行星际闪烁（IPS）无线电数据。PI还预计，在该项目期间，由NSF资助的Murchison Widefield Array射电望远镜将在西澳大利亚州建造。他计划利用地基和天基数据确定全球日光层等离子体结构，重建远程和现场观察到的等离子体结构的形状，并评估和改进他的层析分析技术。最后，PI将把包括磁场在内的太阳风模型纳入太阳风速度和等离子体密度的层析重建中。PI指出，他的层析分析技术提供了一种从地球观察行星际空间的全新方式，并将对日地物理学领域产生广泛的影响。这项研究将直接影响空间天气预测，使太阳和地球之间难以描绘的空间区域变得可见。通过这种层析成像方法产生的日光层等离子体重建产生了五颜六色的图像和电影，这些图像和电影对于外行来说很容易获得，并且为研究和教育提供了有价值的工具。

The Principal Investigator (PI) has developed a tomographic technique that uses data from multiple lines-of-sight at a single observing location to reconstruct the three dimensional plasma density and velocity distribution of coronal mass ejections and co-rotating plasma structures in the heliosphere. In this effort, the PI will apply his tomography technique using real-time heliospheric observations from Japan's Solar-Terrestrial Environment Laboratory, white-light observations from the Solar Mass Ejection Imager (SMEI) spacecraft, and interplanetary scintillation (IPS) radio data from the Ooty Radio Telescope in India and other observatory sites in Mexico and Russia. The PI also anticipates the availability of similar radio data during this project from the NSF-funded Murchison Widefield Array radiotelescope being constructed in Western Australia. Using ground-based and space-based data, he plans to determine the global heliospheric plasma configuration, to reconstruct the shapes of plasma structures observed remotely and in situ, and to evaluate and refine his tomographic analysis technique. Finally, the PI will incorporate solar wind models including magnetic fields into this tomographic reconstruction of solar wind velocity and plasma density. The PI notes that his tomographic analysis technique provides an entirely new way of viewing interplanetary space from Earth and will have a broad impact on the field of solar-terrestrial physics. This investigation will directly impact space weather predictions by making visible the difficult-to-depict region of space between the Sun and the Earth. The heliospheric plasma reconstructions produced by this tomographic method result in colorful images and movies that are easily accessible to the layman, and provide a valuable tool for research and education.