Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1302..192f&link_type=abstract
PICKUP IONS THROUGHOUT THE HELIOSPHERE AND BEYOND: Proceedings of the 9th Annual International Astrophysics Conference. AIP Con
Astronomy and Astrophysics
Astrophysics
1
Pickups, Satellites, Artificial, Solar Wind, Plasma Waves, Pickup Ions, Artificial Earth Satellites, Particle Emission, Solar Wind, Mhd Waves, Plasma Waves, And Instabilities
Scientific paper
During its first year of operations the IBEX satellite discovered a nearly circular ribbon of enhanced fluxes of energetic neutral atoms (ENAs) with energies from 0.2 keV to ~3 keV. One recent model proposes that the ribbon consists of secondary ENAs produced in the outer heliosheath by charge exchange of PUIs from heliosheath and solar wind ENAs with interstellar neutral hydrogen. This mechanism relies on a long lifespan (>1 year) of the PUI partial shell, something that is difficult to justify in view of the expected instability of such distributions. We analyze stability properties of PUI ring-beams produced from solar wind ENAs using a simple linear Vlasov theory and more sophisticated hybrid simulations that trace nonlinear interactions of ions with the self-excited waves. Dispersion analyses produce exponential growth rates of resonant waves of the order of the ion gyrofrequency. We show that many kinds of PUI rings (narrow, broad, and wide) are intrinsically unstable, and that scattering isotropizes them on timescales of days.
Florinski Vladimir
Heerikhuisen Jacob
Zank Gary P.
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