A prolonged He+ enhancement within a coronal mass ejection in the solar wind

Details A prolonged He+ enhancement within a coronal mass ejection in the solar wind A prolonged He+ enhancement within a coronal mass ejection in the solar wind

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..161s&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 2, p. 161-164

Astronomy and Astrophysics

Astrophysics

40

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Solar Wind Plasma

Scientific paper

A coronal mass ejection and magnetic cloud containing an unusually large enhancement of He+ was observed in the solar wind by the plasma and magnetic field instruments on the Advanced Composition Explorer (ACE) spacecraft on May 2-4, 1998. The He+/He++ ratio during this event exceeded 0.5% for a period of more than 24 hours, and reached values as high as 100%. The high He+/He++ ratio indicates the presence of prominence material, and in fact a disappearing filament and prominence were observed at the Sun in association with this event. The prolonged observation of He+ indicates that prominence material extended through much of this CME, the first such observation in a CME in the solar wind.

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