Electrical processes take place in all planetary atmospheres.
There is evidence for lightning on Venus, Jupiter, Saturn, Uranus
and Neptune, it is possible on Mars and Titan, and cosmic rays
ionise every atmosphere, leading to charged droplets and particles.
Controversy surrounds the role of atmospheric electricity in
physical climate processes on Earth; here, a comparative approach
is employed to review the role of electrification in the
atmospheres of other planets and their moons. This book reviews the
theory, and, where available, measurements, of planetary
atmospheric electricity, taken to include ion production and
ion-aerosol interactions. The conditions necessary for a global
atmospheric electric circuit similar to Earth s, and the likelihood
of meeting these conditions in other planetary atmospheres, are
briefly discussed. Atmospheric electrification is more important at
planets receiving little solar radiation, increasing the relative
significance of electrical forces. Nucleation onto atmospheric ions
has been predicted to affect the evolution and lifetime of haze
layers on Titan, Neptune and Triton. For planets closer to Earth,
heating from solar radiation dominates atmospheric circulations.
Mars may have a global circuit analogous to the terrestrial model,
but based on electrical discharges from dust storms, and Titan may
have a similar global circuit, based on transfer of charged
raindrops. There is an increasing need for direct measurements of
planetary atmospheric electrification, in particular on Mars, to
assess the risk for future unmanned and manned missions.
Theoretical understanding could be increased by cross-disciplinary
work to modify and update models and parameterisations initially
developed for a specific atmosphere, to make them more broadly
applicable to other planetary atmospheres. The possibility of
electrical processes in the atmospheres of exoplanets is also
discussed."
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