Abstract

OBSERVATIONS of the interstellar medium in the 500–1,700 A region of the optical spectrum reveals three measurable lines identified as He (584 A), H Ly-β (1,025 A), H Ly-α (1,216 A). The origination of these emissions is dominated by resonance scattering of solar radiation by the interplanetary medium. Here we discuss the first measurements of the H Ly-β line by the Voyager ultraviolet spectrometers and our ability to detect sources other than local singly scattered radiation. The Voyager spectrometers1 were designed primarily for observation of planetary atmospheric emission.

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