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Fitting Flux Ropes to a Global MHD Solution: A Comparison of TechniquesFlux rope fitting (FRF) techniques are an invaluable tool for extracting information about the properties of a subclass of CMEs in the solar wind. However, it has proven difficult to assess their accuracy since the underlying global structure of the CME cannot be independently determined from the data. In contrast, large-scale MHD simulations of CME evolution can provide both a global view as well as localized time series at specific points in space. In this study we apply 5 different fitting techniques to 2 hypothetical time series derived from MHD simulation results. Independent teams performed the analysis of the events in "blind tests", for which no information, other than the time series, was provided. F rom the results, we infer the following: (1) Accuracy decreases markedly with increasingly glancing encounters; (2) Correct identification of the boundaries of the flux rope can be a significant limiter; and (3) Results from techniques that infer global morphology must be viewed with caution. In spite of these limitations, FRF techniques remain a useful tool for describing in situ observations of flux rope CMEs.
Document ID
20040073469
Acquisition Source
Headquarters
Document Type
Preprint (Draft being sent to journal)
Authors
Riley, Pete (Science Applications International Corp. San Diego, CA, United States)
Linker, J. A. (Science Applications International Corp. San Diego, CA, United States)
Lionello, R. (Science Applications International Corp. San Diego, CA, United States)
Mikic, Z. (Science Applications International Corp. San Diego, CA, United States)
Odstrcil, D. (Colorado Univ. Boulder, CO, United States)
Hidalgo, M. A. (Alcala de Henares Univ. Madrid, Spain)
Cid, C. (Alcala de Henares Univ. Madrid, Spain)
Hu, Q. (Delaware Univ. Newark, DE, United States)
Lepping, R. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lynch, B. J. (Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Solar Physics
Funding Number(s)
CONTRACT_GRANT: CIT-PC251439
CONTRACT_GRANT: NAG5-6912
CONTRACT_GRANT: NASW-02027
Distribution Limits
Public
Copyright
Public Use Permitted.

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