Galileo ultraviolet spectrometer experiment - Initial Venus and interplanetary cruise results

Details Galileo ultraviolet spectrometer experiment - Initial Venus and interplanetary cruise results Galileo ultraviolet spectrometer experiment - Initial Venus and interplanetary cruise results

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...253.1548h&link_type=abstract

Science (ISSN 0036-8075), vol. 253, Sept. 27, 1991, p. 1548-1550.

Astronomy and Astrophysics

Astronomy

10

Atmospheric Radiation, Extreme Ultraviolet Radiation, Galileo Spacecraft, Spaceborne Astronomy, Ultraviolet Spectrometers, Venus Atmosphere, Lyman Alpha Radiation, Satellite-Borne Instruments, Spacecraft Instruments, Ultraviolet Spectra, Wavelengths

Scientific paper

The Galileo Extreme Ultraviolet Spectrometer obtained a spectrum of Venus atmospheric emissions in the 55.0- to 125.0-nm wavelength region. Emissions of helium (58.4 nm), ionized atomic oxygen (83.4 nm), and atomic hydrogen (121.6 nm), as well as a blended spectral feature of atomic hydrogen (Lyman-beta) and atomic oxygen (102.5 nm), were observed at 3.5-nm resolution. During the Galileo spacecraft cruise from Venus to earth, Lyman-alpha emission from solar system atomic hydrogen (121.6 nm) was measured. The dominant source of the Lyman-alpha emission is atomic hydrogen from the interstellar medium. A model of Galileo observations at solar maximum indicates a decrease in the solar Lyman-alpha flux near the solar poles. A strong day-to-day variation also occurs with the 27-day periodicity of the rotation of the sun.

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