Evolution of pickup proton spectra in the inner heliosheath and their diagnostics by energetic neutral atom fluxes

Details Evolution of pickup proton spectra in the inner heliosheath and their diagnostics by energetic neutral atom fluxes Evolution of pickup proton spectra in the inner heliosheath and their diagnostics by energetic neutral atom fluxes

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1266c&link_type=abstract

Journal of Geophysical Research Space Physics, Volume 108, Issue A6, pp. SSH 11-1, CiteID 1266, DOI 10.1029/2002JA009492

Physics

15

Interplanetary Physics: Pickup Ions, Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Interstellar Gas, Interplanetary Physics: Energetic Particles, Heliospheric (7514)

Scientific paper

The spatial evolution of pickup protons moving from the termination shock outward to the heliopause, after having suffered stochastic preacceleration in the supersonic solar wind, is studied taking into account ongoing velocity diffusion of the protons in the turbulent Alfvénic fluctuation field. Here only the upwind part of the heliosheath is considered. It is shown that spectra of pickup protons in the inner heliosheath are substantially different from those in the region inside the termination shock. Differential fluxes of energetic neutral atoms originating from pickup protons by charge exchange with interstellar hydrogen atoms in the inner heliosheath and arriving at 1 AU are calculated. It is shown that observations of energetic neutral hydrogen fluxes in a sufficiently wide energy range can be used to place strong limits on the level of solar wind turbulence near the termination shock and further downstream.

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