High-resolution observations of the Lyman alpha sky background

Details High-resolution observations of the Lyman alpha sky background High-resolution observations of the Lyman alpha sky background

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..300a&link_type=abstract

Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 300-308.

Astronomy and Astrophysics

Astrophysics

87

Background Radiation, Interplanetary Medium, Lyman Alpha Radiation, Oao 3, Sky Radiation, Ultraviolet Spectrometers, Earth Atmosphere, Helium, High Resolution, Hydrogen, Interstellar Matter, Neutral Particles, Resonant Frequencies, Solar Radiation

Scientific paper

The first high-resolution observations of the Lyman alpha sky background, obtained with a spectrometer on the Copernicus satellite, are examined. The high-resolution observations presented allow the first direct measurement of the heliocentric velocity of the local interstellar medium. The high resolution of the spectrometer and the projection of the earth's orbital velocity along the line of sight made it possible to separate the weak extraterrestrial background feature from the intense geocoronal emission line. The observations also contain considerable information about the Lyman alpha emission from the geocorona. The data permit limits to be placed on the temperature of the gas that produces the background feature.

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