Solar energetic particle propagation from 1 to 5 AU
Abstract
An analysis of solar particle events, observed by the charged particle detector on board Pioneer 10 and Pioneer 11 is carried out with the goal of experimentally determining the statistical average interplanetary propagation conditions from 3 to 30 MeV. A numerical propagation model was developed that includes diffusion, convection, adiabatic deceleration, and a variable coronal injection profile. A statistical analysis of the entire data set was carried out by individually analyzing each of the parameters that are uniquely defined in a solar particle event. The statistical average radial interplanetary diffusion coefficient from 1 to 5 AU and from 3 to 30 MeV was found to be both independent of radial distance and approximately independent of rigidity. The above diffusion coefficients are inconsistent with both the predictions of the diffusion coefficient from present theoretical transport models and with the diffusion coefficient used in modulation studies at low energies.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1976
- Bibcode:
- 1976PhDT.........1Z
- Keywords:
-
- Charged Particles;
- Interplanetary Medium;
- Propagation Velocity;
- Solar Corpuscular Radiation;
- Diffusion Coefficient;
- Pioneer 10 Space Probe;
- Pioneer 11 Space Probe;
- Radiation Detectors;
- Solar Electrons;
- Solar Protons;
- Solar Physics