Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..960t&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, Aug. 1, 1977, p. 960-970.
Astronomy and Astrophysics
Astrophysics
7
Astronomical Spectroscopy, Io, Periodic Variations, Planetary Magnetic Fields, Potassium, Sodium Vapor, Abundance, Clouds, Emission Spectra, Fraunhofer Lines, Ionizing Radiation, Magnetic Equator
Scientific paper
Spectra of Io's sodium cloud taken 7.5 to 45 sec north and south of Io at a variety of magnetic latitudes of Io obtained during 17 nights of the 1975 apparition of Jupiter confirm the weakening of the cloud in the neighborhood of Jupiter's magnetic equator. The time scale for these changes is 1.5 hours or less. For impact ionization to cause these changes, a minimum flux of 100 billion/sq cm/sec 15 eV electrons or 40 billion/sq cm/sec 8 keV protons is required. Sodium velocities near 10 km/sec are required to explain the replenishment of ionized regions of the cloud. We also obtained spectra of Io's potassium cloud on eight nights during the 1975 apparition. This cloud appears to behave like the sodium cloud as Io's magnetic latitude varies. The potassium, however, may become much weaker as Io passes through the magnetic equator. The brightest intensity measured for the 7665 A resonance line was about 1 kR at a point 7.5 sec east of Io.
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