Differences in the O7+/O6+ ratio of magnetic cloud and non-cloud Coronal Mass Ejections

Details Differences in the O7+/O6+ ratio of magnetic cloud and non-cloud Coronal Mass Ejections Differences in the O7+/O6+ ratio of magnetic cloud and non-cloud Coronal Mass Ejections

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3465h&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 18, p. 3465-3468

Physics

Plasma Physics

42

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Sources Of The Solar Wind, Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

On its trajectory to Jupiter and over the poles of the Sun the Ulysses spacecraft has observed a considerable number of Coronal Mass Ejection (CME) transients in slow and in fast solar wind streams. The analysis of the magnetic field topology and the O7+/O6+ charge state ratio of 56 of these events has yielded strong evidence for a systematic connection between the two features. Coronal mass ejections with magnetic cloud structure have an increased O7+/O6+ ratio with respect to the ambient solar wind whereas non-cloud CMEs do not show enhanced O7+/O6+ ratios. We discuss possible mechanisms based on the freezing-in concept that can account for the observation.

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