Journal Article

Extreme Ultraviolet Observations from Voyager 1 Encounter with Jupiter

Shemansky, D. E., Belton, M. J. S., Holberg, J. B., McConnell, J. C., Takacs, P. Z., Blamont, J. E., Dalgarno, A., Sandel, B. R., Donahue, T. M., Bertaux, J. L., McElroy, M. B., Atreya, S. K., Broadfoot, A. L., Ajello, J. M., Strobel, D. F., Moos, H. W., Goody, R.

1979

Overview

Observations of the optical extreme ultraviolet spectrum of the Jupiter planetary system during the Voyager 1 encounter have revealed previously undetected physical processes of significant proportions. Bright emission lines of S III, S IV, and O III indicating an electron temperature of 10$^{5}$ K have been identified in preliminary analyses of the Io plasma torus spectrum. Strong auroral atomic and molecular hydrogen emissions have been observed in the polar regions of Jupiter near magnetic field lines that map the torus into the atmosphere of Jupiter. The observed resonance scattering of solar hydrogen Lyman $\\alpha $ by the atmosphere of Jupiter and the solar occultation experiment suggest a hot thermosphere (≥ 1000 K) with a large atomic hydrogen abundance. A stellar occultation by Ganymede indicates that its atmosphere is at most an exosphere.

• Publisher: American Association for the Advancement of Science
• Subject: Atmosphere / Emission spectra / Hydrogen / Ions / Jovian atmosphere / Jupiter / Jupiter (Planet) / Line spectra / Magnetic fields / Magnetic polarity / Observations / Plasmas / Space probes / Spectrometers / Wavelengths