IPS tomographic observations of 3D solar wind structure

Abstract

Interplanetary scintillation (IPS) observations have been improved by development of deconvolution methods for the line-of-sight integration effect. One deconvolution method is to use a computer-assisted tomographic analysis (CAT) technique. In this work, four different kinds of CAT method have been developed. Two of them can be applied to stable solar wind structure in the solar minimum phase, one to quasi-stable solar wind, and the other can derive the three-dimensional structure of transient solar wind events, such as a CME. IPS measurements have enough spatial resolution and accuracy to collaborate with spacecraft observations and theoretical studies of the solar wind. Here, these computer assisted tomographic deconvolution methods are introduced and their application to solar wind studies is described.

Keywords:

• Interplanetary scintillation
• Computer-assisted tomography
• Solar wind

Acknowledgements

We thank Paul Hick of the University of California at San Diego for his collaboration in developing the CAT analysis method. This work was partially supported by the Japan Society for the Promotion of Science (Grants 07454115, 12440130, 15340162, 1634017, 19540473).