Expected fluxes of about 1 keV neutral H atoms in interplanetary space - Comparison with the U.V. background and possibility of detection

Details Expected fluxes of about 1 keV neutral H atoms in interplanetary space - Comparison with the U.V. background and possibility of detection Expected fluxes of about 1 keV neutral H atoms in interplanetary space - Comparison with the U.V. background and possibility of detection

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1525b&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 11, p. 1525-1533.

Physics

9

Charge Exchange, Hydrogen Atoms, Interplanetary Gas, Interplanetary Space, Neutral Atoms, Solar Wind, Earth Orbits, Particle Flux Density, Solar Cycles

Scientific paper

We estimate the expected signal and the noise (UV background) for direct detection of fast about 1 keV neutral H atoms originating in charge exchange of the solar wind on interplanetary gases (H, He). The typical fluxes of fast atoms at earth orbit are 0.01-0.0001 cm/s depending on ecliptic longitude and solar cycle variations. The ratio of the neutral to UV fluxes may attain 0.003 (particles-to-photons) at solar minimum and 0.0001 at solar maximum conditions. This makes their detection possible if the UV suppression factor is better than 0.001, which is easily attainable in the laboratory.

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