The Role of Merged Interaction Regions and Drifts in the Heliospheric Modulation of Cosmic Rays beyond 20 AU: A Computer Simulation
Abstract
Voyager 2 magnetic field measurements are used to simulate merged interaction and rarefaction regions (MIRs and RRs) for 1985-1989 via numerical solutions of the time-dependent, axially symmetric transport equation of cosmic rays in the heliosphere, together with the concurrent use of the wavy neutral sheet as a time-dependent drift parameter. This drift approach was found to be more successful, because it was able to reproduce the intensity levels, the factor modulation, and latitudinal gradients for 1 GeV protons at 23 AU.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1993
- DOI:
- 10.1086/172247
- Bibcode:
- 1993ApJ...403..760P
- Keywords:
-
- Computerized Simulation;
- Cosmic Rays;
- Heliosphere;
- Transport Properties;
- Astronomical Models;
- Computational Astrophysics;
- Diffusion Coefficient;
- Time Dependence;
- Two Dimensional Models;
- Space Radiation;
- ACCELERATION OF PARTICLES;
- ISM: COSMIC RAYS;
- SUN: ACTIVITY