Voyager 2 Observations of the Anisotropy of Anomalous Cosmic Rays in the Heliosheath
September 02, 2019
July 02, 2021
We have analyzed data collected from the Cosmic Ray
Subsystem instrument (Stone et al., 1977) on the Voyager 2 (V2) spacecraft during calibration manuevers for the magnetic field instrument while the spacecraft was located in the inner heliosheath of the heliosphere.
We find that there is a diffusive anisotropy in the intensity of ~0.5-35 MeV particles (mostly protons) that indicates that there exists a diffusive flow of these particles from the flank or tail of the heliosphere
towards the nose and is slightly equatorward as well.
This work is consistent with the findings of an earlier, similar, but more restricted study (Stone et al., 2017).
Depending on which part of the energy range is the main contributor to the observed diffusive anisotropy, these results may indicate that the acceleration site of anomalous cosmic rays is back towards the flank or tail of the
solar wind termination shock.
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