An interpretation of the dawn-dusk asymmetry of UV emission from the Io plasma torus

Details An interpretation of the dawn-dusk asymmetry of UV emission from the Io plasma torus An interpretation of the dawn-dusk asymmetry of UV emission from the Io plasma torus

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..232i&link_type=abstract

Nature, vol. 302, Mar. 17, 1983, p. 232, 233.

Physics

42

Io, Space Plasmas, Ultraviolet Radiation, Diurnal Variations, Earth Magnetosphere, Voyager Project, Jupiter, Diurnal Variations, Ultraviolet, Wavelengths, Asymmetry, Io, Emissions, Satellites, Plasma Torus, Morphology, Energy, Electrons, Density, Oxygen, Sulfur, Brightness, Patterns, Irradiation, Heating, Modulation, Convection, Injection, Cooling

Scientific paper

Dawn to dusk side brightening to dimming of the Io plasma torus EUV emissions observed by the Voyager spacecraft are discussed. The asymmetry reaches a level of nearly 30% in the EUV and 20% for the electron energy density necessary for exciting the oxygen and sulfur ion UV emissions. The drift shell effect is discussed, wherein periodic adiabatic heating and cooling of the electron gas produces the modulation of the UV irradiation. The radial distance of the L shell of the Io plasma torus would need to reach a minimum around 1800 h LT and a maximum at about 0600 h LT, a drift pattern that is possible if plasma convection of the Jovian magnetosphere were at least partially controlled by the planetary wind outflow. The electrostatic field that modulates the UV excitation rate would point from dawn to dusk and feature a strength of about 1.6 mV/m.

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