Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...724.1256j&link_type=abstract
The Astrophysical Journal, Volume 724, Issue 2, pp. 1256-1261 (2010).
Astronomy and Astrophysics
Astronomy
3
Instabilities, Ism: Abundances, Solar Wind, Waves
Scientific paper
We report the observation of a spectral enhancement in the magnetic field fluctuations measured by the MAG instrument on the Voyager 2 spacecraft during 4.5 hr on DOY 7, 1979 at a heliocentric radial position of 4.5 AU. This time period is contained within a solar wind rarefaction when the large-scale interplanetary magnetic field was nearly radial. The frequency range and polarization of the enhanced fluctuations are consistent with waves generated by newly ionized interstellar H+ and He+. We show sunward propagation of the waves via a cross-helicity analysis. We compare the observation with a theoretical model and find reasonable agreement given the model assumptions. This event is the first indication of pickup ion-generated waves seen at Voyager. It is also the first identification of pickup He+ waves by any spacecraft.
Isenberg Philip A.
Joyce Colin J.
Murphy Neil
Schwadron Nathan A.
Smith Charles W.
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