Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh43c..05z&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH43C-05
Physics
2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields, 7514 Energetic Particles (2114)
Scientific paper
We present the first model calculation of solar energetic particle propagation in realistic 3-dimensional heliopsheric magnetic field. The model includes essentially all the particle transport mechanisms: streaming along magnetic fields, convection with the solar wind, pitch-angle diffusion, focusing, perpendicular diffusion, and pitch-angle dependent adiabatic cooling. We solve the Fokker-Planck transport equation with simulation of backward stochastic processes in a fixed reference frame. Here we focus on high-energy E > ~ 10 MeV solar energetic particles that are accelerated and injected near the Sun. The source of solar energetic particles can be either solar flares or coronal mass ejections, both having limited coverage of latitude and longitude on the solar surface. We compute the particle flux and anisotropy profiles at various observation locations in interplanetary space up to 5 AU from the ecliptic to the solar poles. We found that solar energetic particles are observed no matter whether an observer is directly connected to solar source by the magnetic field. Our model calculation results can explain why we often see solar energetic particles reach an almost uniform reservoir in the inner heliosphere a few days after the onset of a solar energetic particle event and then the intensities of particles in a broad range of energies decay uniformly everywhere. This phenomenon can happen without a need of particle diffusion barrier in the outer heliosphere. We will discuss what mechanism is responsible for the formation of such a reservoir and what role the perpendicular diffusion plays in the transport of solar energetic particles.
Qin Gan
Rassoul Hamid
Zhang Minghui
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