Temporal variation of the Jovian H I Lyman alpha emission (1979-1986)

Details Temporal variation of the Jovian H I Lyman alpha emission (1979-1986) Temporal variation of the Jovian H I Lyman alpha emission (1979-1986)

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93...29s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 29-34.

Physics

27

Jupiter Atmosphere, Lyman Alpha Radiation, Solar Activity, Solar Cycles, Temporal Distribution, Upper Atmosphere, Abundance, Field Of View, Hydrogen Atoms, Iue, Pioneer 10 Space Probe, Voyager Project, Jupiter, Lyman-Alpha Radiation, Emissions, Iue Satellite, Hydrogen, Satellite Observations, Atmosphere, Brightness, Resonance, Scattering, Abundance, Electroglow, Cycles, Comparisons, Optical Properties, Ultraviolet, Wavelengths

Scientific paper

The results of long-term monitoring of the Jovian Lyman-alpha brightness with the IUE are presented. The measurements span the current solar cycle from maximum in late 1979 to the present period of minimum solar activity. The long-term variation seen in the brightness during the declining phase of the cycle matches the decrease in the solar Lyman-alpha flux during this period and is significantly smaller than the variability implied by Pioneer 10 for the first half of the cycle. The hydrogen bulge, a region of enhanced and variable Lyman-alpha emission located near magnetic longitude 100 deg, has been a persistent feature of the Jovian upper atmosphere throughout the eight-year period of the observations, and the average bulge intensity has also followed the solar cycle decrease in Lyman-alpha. Implications for the Jovian upper atmosphere and the electroglow phenomenon on Jupiter during the observational period are discussed.

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