Letter | Published:

Concentration of Nightglow Hα-emission to the Ecliptic and the Radial Velocities of this Line

Naturevolume 199page990 (1963) | Download Citation



DURING the winter of 1962–63 I examined the distribution of Ha-intensity over the night sky. A Fabry-Pérot étalon was used with a spacing of 0.3 mm and reflexion coefficient 0.91 at Ha. An interference filter of 30 Å half-width was used as premonochromator. A contact image intensifier was used for registering the fringes. The whole system was installed on a small equatorial mounted in a tube in which temperature was controlled. The observations were made at the high-altitude station of the Sternberg Astronomical Institute (ϕ = 44°, h = 3,000 m) near Alma-Ata. One-hour exposure was sufficient to record H and OH fringes at any point of the sky, including the zenith.

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  1. Sternberg Astronomical Institute, Moscow

    • P. V. SHEGLOV


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