title: Rocket-borne instrumentation using the resonant absorption technique to study the geocoronal and interplanetary helium emissions.
abstract: A rocket payload able to perform a thorough and independent analysis of the He I 58.43340-nm geocoronal and interplanetary emissions is presented. It includes a sun-pointed resonant absorption spectrometer and a sky-scanning resonant absorption photometer. Both incorporate a similar helium resonance cell of original design featuring a most flexible pressure scanning capability and an accurate pressure measuring device, so that scanning by wavelength bandpasses from 20 down to 1 pm can be achieved. A description of the design and calibration of the instrument is given, followed by an indication of its successful operation in flight.
authors.affiliation: Laboratoire de Physique Stellaire et Planétaire, P.O. Box 10, 91370 Verrieres le Buisson, France.
authors.forename: J F
authors.initials: JF
authors.lastname: Crifo
authors.forename: H J
authors.initials: HJ
authors.lastname: Fahr
authors.forename: P
authors.initials: P
authors.lastname: Seidi
authors.forename: C
authors.initials: C
authors.lastname: Wulf-Mathies