Optical observations of interplanetary pick-up ions: The experiment Helly

Details Optical observations of interplanetary pick-up ions: The experiment Helly Optical observations of interplanetary pick-up ions: The experiment Helly

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.291..229f&link_type=abstract

In ESA, European Rocket and Balloon Programs and Related Research p 229-232 (SEE N90-13826 05-42)

Computer Science

Sound

Helium Ions, Interplanetary Medium, Plasmasphere, Sounding Rockets, Distribution Functions, Luminous Intensity, Resonance Scattering, Solar Radiation

Scientific paper

A rocket mission, called HELLY (helium-Lyman alpha line), devoted to the observation of solar He II 304 angstrom photons resonantly scattered at plasmaspheric and interplanetary He II ions is described. Such observations are carried out at the night side of the Earth. In these conditions, a scan out of the sunlit part of the terrestrial plasmasphere into the antisolar core shadow region can be carried out. The 304 angstroms signal strength is sensitively determined by the shape of the velocity distribution function of interplanetary He II pickup ions.

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