Observations of helium in the interplanetary/interstellar wind - The solar-wake effect

Astronomy and Astrophysics – Astronomy

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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.

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