Interplanetary coronal mass ejection influence on high energy pick-up ions at Venus

Details Interplanetary coronal mass ejection influence on high energy pick-up ions at Venus Interplanetary coronal mass ejection influence on high energy pick-up ions at Venus

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010p%26ss...58.1784m&link_type=abstract

Planetary and Space Science, Volume 58, Issue 14-15, p. 1784-1791.

Computer Science

5

Scientific paper

We have used the ion mass analyzer (IMA) and magnetometer (MAG) on Venus Express (VEX) to study escaping O+ during interplanetary coronal mass ejections (ICMEs). Data from 389 VEX orbits during 2006 and 2007 revealed 265 samples of high energy pick-up ion features in 197 separate orbits. Magnetometer data during the same time period showed 17 ICMEs. The interplanetary conditions associated with the ICMEs clearly accelerate the pick-up ions to higher energies at lower altitudes compared to undisturbed solar wind. However, there is no clear dependence of the pick-up ion flux on ICMEs which may be attributed to the fact that this study used data from a period of low solar activity, when ICMEs are slow and weak relative to solar maximum. Alternatively, atmospheric escape rates may not be significantly changed during ICME events.

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