Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31a09m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH31A-09
Physics
7514 Energetic Particles (2114), 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
We present initial results from a self-consistent simulation of particle acceleration and atmospheric heating during impulsive solar flares. The simulation code consists of two main components, the UAH SDSPAC (Spatially-Dependent Stochastic Particle Acceleration Code) and the NRL DSFTM (Dynamic Solar Flux Tube Model) code, together with an interface that allows these two components to communicate. Particle acceleration occurs via cascading MHD turbulence. MHD turbulence (consisting of an admixture of fast mode and Alfvén waves) is generated at large scales in the corona and subsequently cascades through the inertial range and into the dissipation range, where it stochastically accelerates both ambient electrons and protons via transit-time and cyclotron resonance, respectively. Both species are energized from thermal to relativistic energies on subsecond timescales. Some of the energetic particles then escape from the corona and enter the chromosphere, where they thermalize through Coulomb collisions. The heated chromosphere then expands into the corona, where the increased density and temperature greatly affect the efficiency of the acceleration process. The highly nonlinear interaction between the acceleration process and the atmospheric response is described by a combined quasilinear and hydrodynamic simulation, based upon the two previously-employed codes above. This is, to our knowledge, the first simulation that acurately takes into account both the micro- and macro-physics of particle acceleration. We present preliminary results such as spatially-dependent energetic particle distributions, coronal temperatures, and densities, and also discuss their application to the spatially-resolved hard and soft X-ray spectra to be obtained from HESSI. This work is supported by NASA Solar Physics SR&T grant NAG5-8480.
Mariska John T.
Miller Aaron J.
No associations
LandOfFree
Solar Flare Particle Acceleration and Atmospheric Response 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 Solar Flare Particle Acceleration and Atmospheric Response, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solar Flare Particle Acceleration and Atmospheric Response will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1274384