Intense Ly-alpha emission from Uranus

Details Intense Ly-alpha emission from Uranus Intense Ly-alpha emission from Uranus

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..428d&link_type=abstract

Nature, vol. 299, Sept. 30, 1982, p. 428, 429.

Physics

25

Hydrogen Atoms, Lyman Alpha Radiation, Planetary Radiation, Uranus (Planet), Auroras, Electromagnetic Scattering, Iue, Solar Radiation

Scientific paper

The existence of intense atomic hydrogen Ly-alpha emission from Uranus is demonstrated here by utilizing the monochromatic imaging capabilities of the International Ultraviolet Explorer (IUE) spectrograph. Observations show increased emission in the vicinity of Uranus superimposed on the geocoronal/interplanetary background. If resonant scattering of solar Ly-alpha is the source of the 1.6 + or - 0.4 kR disk averaged brightness, then very high column densities of atomic H above the absorbing methane are required. Precipitation of trapped charged particles, i.e., aurora, could explain the emissions. This would imply a planetary magnetic field.

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