Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41a1636l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH41A-1636
Physics
[2101] Interplanetary Physics / Coronal Mass Ejections, [2194] Interplanetary Physics / Instruments And Techniques
Scientific paper
We discuss how remote-sensing observations by multiple white-light imagers can provide some information about the azimuthal deflection and azimuthal expansion of Coronal Mass Ejections (CMEs) as they propagate in the heliosphere. Our analysis focuses on one CME which was well observed by the SECCHI/HIs onboard STEREO-A and B on April 26-28, 2008. By considering two simple models of CME geometry and using simultaneous observations from the two different viewpoints, we show that the observations can be best understood by modeling the CME as a propagating sphere of expanding radius on a fixed radial trajectory. Preliminary analysis shows that the CME expansion is self-similar from 0.2 AU until 0.5 AU and slows down afterwards. An alternative explanation of the observations is a deflection towards the east of a bubble CME. While observational effects may play a role, the results from these two models are corroborated by the non-detection of the CME at L1, where a CME hit was expected based on its initial width and direction.
Hernandez J. N.
Lugaz Noé
Roussev Ilia I.
Vourlidas Angelos
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