Physics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt.........5v&link_type=abstract
Ph.D. thesis, Univ. Turku, Annales Universitatis Turkuensis AI 226, pp. 1-111, (1998)
Physics
2
Scientific paper
This work is a description of a numerical method, Monte-Carlo simulations, to solve equations describing energetic-particle transport and acceleration in interplanetary space. We start with a review of the relevant transport and acceleration models and then give a complete description of the numerical method. The simulations are used for two purposes: first, to calculate Green's functions for interplanetary transport of solar cosmic rays under the focused transport model and, second, to model the acceleration of energetic particles in travelling interplanetary shock waves. The simulated Green's functions are used in the analysis of experimental data to deduce the interplanetary scattering conditions as well as the energetic-particle injection during two solar energetic particle events related to solar flares on 24 May 1990 and 9 July 1996. The two solar energetic particle events seem to be best explained by a prolonged energetic-particle injection at the travelling interplanetary shock wave driven by the flare-related coronal mass ejections. This injection is modelled physically by considering first-order Fermi acceleration at the shock front. The results of these simulations indicate that the process is capable of accelerating ions up to energies ~ 100 MeV per nucleon provided that the mean free path of the energetic ions upstream from the shock is small, less than a few tens of Larmor radii. To be able to produce observed intensity-time profiles, the model needs and upstream mean free path with non-homogeneous properties, i.e., a region of enhanced scattering extending a fraction of the shock's radius upstream from the shock front, followed by a much longer mean free path between the region and the observer at 1 AU. The studied model can simultaneously explain both the diffusive time-intensity profiles observed above 10 MeV per nucleon and the profiles peaking strongly during the shock passage, the energetic storm particle events observed at low energies, at the MeV range and below.
No associations
LandOfFree
Monte-Carlo Simulations of Interplanetary Transport and Acceleration of Energetic Particles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Monte-Carlo Simulations of Interplanetary Transport and Acceleration of Energetic Particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monte-Carlo Simulations of Interplanetary Transport and Acceleration of Energetic Particles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1865731