Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2309k&link_type=abstract
American Astronomical Society, SPD meeting #42, #23.09; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
With the SECCHI/STEREO observations, it is now possible to observe CME trajectories in interplanetary space. The twin spacecraft configuration of STEREO also allows one to, for the first time, continuously track a CME's trajectory from the Sun to 1 AU and in cases where the ejecta is encountered by another spacecraft at 1 AU, measure the in situ magnetic field and plasma properties of the CME ejecta. We have examined a number of CME events whose trajectories were continuously observed by one STEREO spacecraft and the ejecta were intersected by the other STEREO spacecraft or ACE at L1. We have applied the erupting flux rope model of CMEs (EFR) to these events and calculated the best-fit solutions and the physical quantities predicted by these solutions. For each event, it is possible to find a narrow range of solutions that fit the observed trajectory to within 1 to 2 % of the position data. The calculated magnetic field and average temperature and density of the resulting flux rope are compared with the in situ data. It is found that the 1-AU quantities predicted by the best-fit solutions for these events are in good agreement with the in situ data and that the calculated 1 AU magnetic field is insensitive to the form of the poloidal flux injection function, provided the injected energy is unchanged. We discuss in detail how the magnetic field of a CME evolves through interplanetary space, emphasizing the quantitative relationship between the CME trajectory and the evolution of the CME magnetic field. The discussion will focus on a physical understanding that can be used to interpret observational data and numerical results of simulation models of CMEs.
Chen Jiahua
Howard Ralph
Kunkel Valbona
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