title: Origin and dynamical behaviour of thermal protons in the Venusian ionosphere.
abstract: An important source of thermal H(+) and/or D(+) has been overlooked in the ionosphere of Venus which supports the choice of H(+) and/or D(+) as the dominant light ion at high altitudes.
authors.affiliation: Department of Applied Physics and Information Science, Institute for Pure and Applied Physical Science, La Jolla, California 92037, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Banks
authors.forename: W I
authors.initials: WI
authors.lastname: Axford