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Modeling of particle acceleration at multiple shocks via diffusive shock acceleration: preliminary results
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Zank, G. P. Parker, L. Neergaard |
| Copyright Year | 2013 |
| Description | Successful forecasting of energetic particle events in space weather models require algorithms for correctly predicting the spectrum of ions accelerated from a background population of charged particles. We present preliminary results from a model that diffusively accelerates particles at multiple shocks. Our basic approach is related to box models in which a distribution of particles is diffusively accelerated inside the box while simultaneously experiencing decompression through adiabatic expansion and losses from the convection and diffusion of particles outside the box. We adiabatically decompress the accelerated particle distribution between each shock by either the method explored in Melrose and Pope (1993) and Pope and Melrose (1994) or by the approach set forth in Zank et al. (2000) where we solve the transport equation by a method analogous to operator splitting. The second method incorporates the additional loss terms of convection and diffusion and allows for the use of a variable time between shocks. We use a maximum injection energy (E(sub max)) appropriate for quasi-parallel and quasi-perpendicular shocks and provide a preliminary application of the diffusive acceleration of particles by multiple shocks with frequencies appropriate for solar maximum (i.e., a non-Markovian process). |
| File Size | 1973875 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140006450 |
| Archival Resource Key | ark:/13960/t21c7060s |
| Language | English |
| Publisher Date | 2013-12-09 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Wave-particle Interactions Solar Activity Effects Acceleration Physics Interplanetary Shock Waves Shock Wave Interaction Space Weather Mathematical Models Particle Acceleration Diffusivity Energetic Particles Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
