Characterizing ICME Structures and Its Applications to CME-ICME Connection

Details Characterizing ICME Structures and Its Applications to CME-ICME Connection Characterizing ICME Structures and Its Applications to CME-ICME Connection

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh43a..05h&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH43A-05

Mathematics

Logic

2101 Coronal Mass Ejections (7513), 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2194 Instruments And Techniques, 7519 Flares, 7833 Mathematical And Numerical Techniques (0500, 3200)

Scientific paper

We examine the structures of the Interplanetary Coronal Mass Ejections (ICMEs) by using multi-spacecraft in-situ measurements. The method employed is the Grad-Shafranov (GS) reconstruction technique, which has been well developed and recently gained momentum in applying to STEREO in-situ data. The applicability of the method to multi-spacecraft data has been successfully demonstrated especially by using Cluster mission data. However the original method only applies to a geometry of a straight cylinder, which, sometimes, is not adequate to describe the structure of an ICME in large scale. An extension of the method, applicable to the structure of a torus, has been developed, and tested against a case of ICME propagation in the inner heliosphere from MHD simulations. The results showed significant improvement upon the alternative approach assuming a cylindrical geometry in this case. We will present a few more case studies, utilizing data from Helios, or STEREO, and ACE/Wind spacecraft missions. Moreover we will compare the structures of the ICMEs with their corresponding source regions at the Sun, embodying various remote imaging observations. In addition to qualitative morphological study, we seek quantitative connection between CMEs and ICMEs, in terms of their magnetic flux budget, and discuss implications to the underlying mechanism for solar eruption.

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