The dayside Venus ionosphere: I. Pioneer-Venus retarding potential analyzer experimental observations |
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| Authors: | Kent L Miller William C Knudsen Karl Spenner |
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| Institution: | 1. Lockheed Palo Alto Research Laboratory, Department 52-12, Building 255, 3251 Hanover Street, Palo Alto, California 94304, USA;2. Institut fur Physikalische Messtechnik, D78 Freiburg, BRD, Heidenhofstrass 8, West Germany |
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| Abstract: | The median values of the principal ionospheric quantities of the Venus dayside ionosphere are presented. The values are derived from the quantities measured by the Pioneer-Venus orbiter retarding potential analyzer over a period of two Earth yaers at solar cycle maximum. Quantities reported are total ion density, O+ density, O2+ density, sum density (NO+ + N2+ + CO+), CO2+ density, ion temperature, electron temperature, and plasma particle pressure. The data are organized to reveal altitude, solar zenith angle, solar longitude, and latitude dependences. The O+ density exhibits both a solar longitude and a latitude dependence which we suggest is caused by superrotation of the thermosphere and/or ionosphere. Asymmetry between the dawn and dusk terminator regions in the behavior of other quantities is also descibed. |
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