Enhanced low energy (1 MeV) ion fluxes in the outer heliosphere

Details Enhanced low energy (1 MeV) ion fluxes in the outer heliosphere Enhanced low energy (1 MeV) ion fluxes in the outer heliosphere

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1359g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 35, Nov. 1987, p. 1359-1366. NASA-supported research.

Physics

2

Heliosphere, Ions, Voyager 2 Spacecraft, Ion Temperature, Particle Flux Density

Scientific paper

The Low Energy Charged Particle (LECP) experiment on the Voyager 2 spacecraft in the outer heliosphere (greater than 10 AU) has observed several occasions when there was a peak in the interplanetary ion spectra for ions of energies of about 0.5-1.0 MeV. Such enhancements can last for several days, suggesting that at these times particles of these energies dominate the low energy cosmic population in this region of the heliosphere. Two specific cases are discussed. The enhancements seem to be associated with the passage of transient interplanetary shock events, with the ion anisotropies generally showing outflow. The most straight-forward explanation for the observations seems to involve only a propagation effect of ions from the inner to the outer solar system. This conclusion is supported by simple modeling of the propagation of an event observed at 1 AU to the spacecraft at about 12 AU.

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