Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193..471w&link_type=abstract
Astrophysical Journal, vol. 193, Oct. 15, 1974, pt. 1, p. 471-476.
Astronomy and Astrophysics
Astronomy
100
Astronomical Photometry, Helium, Interplanetary Medium, Interstellar Gas, Solar Wind, Spaceborne Astronomy, Far Ultraviolet Radiation, Gas Temperature, Lyman Alpha Radiation, Magnetohydrodynamic Flow, Satellite-Borne Instruments, Solar Activity Effects, Ultraviolet Photometry
Scientific paper
Extraterrestrial neutral helium radiation was detected by the thin-film/photomultiplier photometers (170-1500 A) on board the STP 72-1 satellite. The observed sky map of extraterrestrial He I 584 A radiation is in excellent agreement with the expectations of the interstellar wind theory: the helium is gravitationally focused producing a downwind wake. Observations were analyzed by a computer-coded radiation-scattering model. The appearance of a neutral helium-radiation maximum in the downstream direction and a hydrogen-radiation maximum upstream is accurately accounted for by models of solar radiation scattered from a gas cloud moving through the interplanetary system.
Meier Robert R.
Weller C. S.
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