Physics – Plasma Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3612109m&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 12, CiteID L12109
Physics
Plasma Physics
2
Interplanetary Physics: Heliopause And Solar Wind Termination, Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Space Plasma Physics: Radiation Processes, Interplanetary Physics: Pickup Ions
Scientific paper
The 2-3 kHz radio emissions observed by the Voyager spacecraft are thought to turn on where pick-up ions drive lower-hybrid waves. Previous work focused on pick-up ions born via charge exchange with neutrals from the inner heliosheath. However, Boltzmann simulations show that inner heliosheath neutrals have significantly lower speeds after crossing the heliopause compared with fluid simulations. We calculate the pick-up ion distributions resulting from charge exchange with various neutral species, finding that neutrals born in the supersonic solar wind give a ring-beam distribution, but inner heliosheath neutrals do not. The emission theory survives with supersonic solar wind neutrals as the pick-up ion source. This leads to increases in the ring-beam and electron tail speeds, available lower-hybrid wave energy, and radio flux. Larger ring speeds increase the necessary magnetic field to $\gtrsim$0.2 nT, constraining the source location, and predicting magnetic field strengths agreeing with heliosphere and interstellar medium models.
Cairns Iver H.
Heerikhuisen Jacob
Mitchell Jeffrey J.
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