Accession Number : AD0487550

Title :   SATELLITE-BORNE LYMAN-ALPHA EXPERIMENTS.

Descriptive Note : Preliminary rept. 1 Jul 65-15 Mar 66,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s) : Clark, M. A.

Report Date : APR 1966

Pagination or Media Count : 54

Abstract : An experimental program to study the hydrogen Lyman-alpha radiation outside the bulk of the earth's atmosphere is described. The purpose of the experiments is to study the radiation arising from resonant scattering of solar Lyman-alpha radiation by atmospheric and interplanetary neutral atomic hydrogen and Lyman-alpha radiation from other sources. Understanding of the density, temperature, and distribution of atmospheric hydrogen, and their diurnal and solar-cycle variations, is the objective of the program. Satellite-borne instruments have been developed, in particular a narrow-band photometer and a sky-scanning photometer that incorporates an atomic hydrogen filter to analyze the radiation. (Author)

Descriptors :   (*SOLAR RADIATION, SPACE PROBES), (*ULTRAVIOLET SPECTROSCOPY, SOLAR RADIATION), ABSORPTION SPECTRA, SCATTERING, HYDROGEN, ALPHA PARTICLES, ATMOSPHERIC TEMPERATURE, DIURNAL VARIATIONS, DENSITY, DIFFUSION, SKY, AREA COVERAGE, SCIENTIFIC SATELLITES, INSTRUMENTATION, DETECTION, CALIBRATION, BACKGROUND, PHOTOMETERS, MEASUREMENT, PHOTOMULTIPLIER TUBES.

Subject Categories : Astrophysics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE