Hord, C. W.;
Barth, C. A.;
Esposito, L. W.;
McClintock, W. E.;
Pryor, W. R.;
Simmons, K. E.;
Stewart, A. I. F.;
Thomas, G. E.;
Ajello, J. M.;
Lane, A. L.;
West, R. W.;
Sandel, B. R.;
Broadfoot, A. L.;
Hunten, D. M.;
Shemansky, D. E.
Galileo Ultraviolet Spectrometer Experiment: Initial Venus and Interplanetary Cruise Results
Beteiligte:
Hord, C. W.;
Barth, C. A.;
Esposito, L. W.;
McClintock, W. E.;
Pryor, W. R.;
Simmons, K. E.;
Stewart, A. I. F.;
Thomas, G. E.;
Ajello, J. M.;
Lane, A. L.;
West, R. W.;
Sandel, B. R.;
Broadfoot, A. L.;
Hunten, D. M.;
Shemansky, D. E.
Erschienen:
American Society for the Advancement of Science, 1991
Beschreibung:
<p> The Galileo Extreme Ultraviolet Spectrometer obtained a spectrum of Venus atmospheric emissions in the 55.0- to 125.0-nanometer (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-β) and atomic oxygen (102.5 nm), were observed at 3.5-nm resolution. During the Galileo spacecraft cruise from Venus to Earth, Lyman-α emission from solar system atomic hydrogen (121.6 nm) was measured. The dominant source of the Lyman-α emission is atomic hydrogen from the interstellar medium. A model of Galileo observations at solar maximum indicates a decrease in the solar Lyman-α flux near the solar poles. A strong day-to-day variation also occurs with the 27-day periodicity of the rotation of the sun. </p>