Contribution of Lyman alpha geocoronal emission to the measurement of low fluxes of charged particles by electrostatic analyzers

Details Contribution of Lyman alpha geocoronal emission to the measurement of low fluxes of charged particles by electrostatic analyzers Contribution of Lyman alpha geocoronal emission to the measurement of low fluxes of charged particles by electrostatic analyzers

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ang....32..381p&link_type=abstract

Annales de Geophysique, vol. 32, Oct.-Dec. 1976, p. 381-389.

Computer Science

Sound

Geocoronal Emissions, Lyman Alpha Radiation, Proton Flux Density, Rocket Sounding, Spread F, Background Radiation, Calibrating, Electrostatic Probes, Ultraviolet Radiation

Scientific paper

Proton flux measurements performed with an electrostatic analyzer on board a rocket launched from Mar del Plata (Argentina) provided an abnormally high background. Laboratory instrument calibration made at wavelengths corresponding to the main atmospheric emissions between 300 and 1500 A have shown that most of the measured signal was due to Lyman-alpha emission. Theoretical calculations of the Lyman-alpha scattering through geocoronal models are in good agreement both with the absolute values and the relative variations of the signal. Using the different energy levels, it was then possible to deduce the remaining true 'proton signal'. The corresponding flux values, much weaker than any previous measurement performed with the same kind of apparatus, suggest that optical contaminations could be a rather general problem.

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