The possibility that singly ionized helium enhancements observed near 1 AU are due to ion pickup from Venus is examined and found to be implausible. It is still possible that Venus ions are present in the solar wind with sufficiently high fluxes to be detectable by earth-orbiting spacecraft near the time of inferior conjunction. Because of the inclination of Venus' orbit to the ecliptic, some inferior conjunctions are more favorable for such a search than others. In particular, the inferior conjunctions on June 17, 1972, and June 15, 1980, are most favorable for detection. |