Microwave Effects of Gaseous Sulfur Dioxide (SO(2)) in the Atmosphere of Venus and Earth

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Scientific paper

This research has been motivated by the need to understand the microwave effects of gaseous sulfur dioxide (SO2) in the atmospheres of Venus and Earth. The objective has been to conduct high accuracy laboratory measurements of the microwave absorbing and refracting properties of gaseous SO2 at frequencies (wavelengths) of 2.25 GHz (13.3 cm), 8.5 GHz (3.5 cm), and 21.7 GHz (1.4 cm) and to apply these measurements to the interpretation of data obtained from two different techniques that are used to study the atmosphere of Venus; namely, spacecraft radio occultation experiments and Earth-based radio astronomical observations. In addition, the SO2 measurements has been applied to the understanding of spaceborne interferometric synthetic aperture radar (INSAR) images of terrestrial volcanoes. Another important part of this research has been the conduct of a microwave observation of Venus using the Very Large Array (VLA), which has resulted in two high spatial resolution maps of continuum emission at wavelengths of 1.3 cm and 2 cm. Based on our measurements of the microwave properties of gaseous SO2, these VLA emission maps have been used to detect potential spatial variations in the abundances and distribution of gaseous SO2 across the disk of Venus.

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