Publication Date:
2011-08-19
Description:
Plasma analyzer data obtained by Pioneer 7 during its approach to about 12.1 million km from the nucleus of Comet P/Halley are presently interpreted as He(+) generated by charge exchange of the solar wind He(2+) with neutral cometary material. The maximum He(+) flux was detected several hours after the closest March 20, 1986 approach of the spacecraft, and is noted to be not only larger than expected, but also to exhibit large, discontinuous flux changes.
Keywords:
ASTRONOMY
Type:
Icarus (ISSN 0019-1035); 71; 192-197
Format:
text
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