Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - SH - Solar & Heliospheric
Voyager 2 Observations of the Anisotropy of Anomalous Cosmic Rays in the Heliosheath
A. Cummings,* E. Stone, B.C. Heikkila, N. Lal, J. Richardson
*corresponding author
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Pre-published on: 2019 July 22
Published on:
Abstract
We have analyzed data collected from the Cosmic Ray
Subsystem (CRS) 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 $\sim$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 supports the conclusion of an earlier, similar, but more restricted study (Stone et al., 2017)
that the acceleration site of anomalous cosmic rays is back along
the flank or tail of the solar wind termination shock.
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