The eastward deflection of fast coronal mass ejecta in interplanetary space

Details The eastward deflection of fast coronal mass ejecta in interplanetary space The eastward deflection of fast coronal mass ejecta in interplanetary space

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212399g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12399-12406. DOE-sponsored research.

Physics

26

Deflection, Solar Corona, Solar Wind, Stellar Mass Ejection, Ejecta, Pressure Distribution, Radiation Pressure, Solar Corpuscular Radiation, Space Plasmas

Scientific paper

Previous work has shown that a bidirectional solar wind electron heat flux is one of the more prominent signatures of a coronal mass ejection event in the solar wind at 1 AU. Using ISEE 3 solar wind electron measurements obtained during 1978 and 1979, this signature was used to identify the fast coronal mass ejecta driving 19 interplanetary shocks. In 17 of the 19 shock events an eastward deflection of the ejection plasma (apparent arrival from west of the sun) was observed. The average eastward deflection for all of the events was about 3 deg, corresponding to a typical transverse velocity of 25 km/s. Usually an oppositely directed (i.e., westward) flow deflection of comparable magnitude was observed within the compressed ambient plasma ahead of the ejecta. The sense of these deflections - first westward within the compressed ambient plasma and then eastward within the ejecta - is the same as is observed near the leading edges of quasi-stationary, corotating high speed streams.

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