Speaker
Du Toit Strauss
(North-West University, South Africa)
Description
When the Voyager 1 spacecraft crossed the heliopause, energetic particle observations showed unexpectedly large anisotropies in the local interstellar medium. For high energy galactic cosmic rays, the anisotropy is such that a deficiency of particles near pitch-angles of 90 degrees was recorded. For low energy anomalous cosmic rays, the anisotropy is completely different; an enhancement near 90 degrees was observed. We put forward a simple explanation for these seemingly incongruous anisotropies based on (perpendicular) diffusion across the heliopause that is more efficient at certain pitch-angles. We motivate our choice of transport parameters and present results that are in qualitative agreement with Voyager measurements, vindicating to a certain extent our modeling efforts.
| Registration number following "ICRC2015-I/" | 1100 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Du Toit Strauss
(North-West University, South Africa)
Co-author
Dr
Fichtner Horst
(Ruhr University, Bochum)
