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Effect of adiabatic deceleration on the focused transport of solar cosmic rays
Ruffolo, D.
AA(Chulalongkorn Univ., Bangkok, Thailand)
Astrophysical Journal (ISSN 0004-637X), vol. 442, no. 2, Part 1, p. 861-874 (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Deceleration, Interplanetary Magnetic Fields, Particle Acceleration, Radiation Transport, Solar Cosmic Rays, Solar Protons, Solar Wind, Transport Theory, Adiabatic Flow, Astronomical Models, Convection, Particle Flux Density, Particle Trajectories, Solar Flares
Bibliographic Code:


In the frameworkof focused transport theory, adiabatic deceleration arises from adiabatic focusing in the solar wind frame and from differential solar wind convection. An explicit formula is given for the deceleration of individual particles as a function of the pitch angle. Deceleration and other first-order effects of the solar wind, including convection, are incorporated into a numerical code for simulating the transport of energetic particles along the interplanetary magnetic field. We use this code to model the transport of solar flare protons. We find that including deceleration can increase the decay rate of the near-Earth intensity by 75% more than would be expected based on advection from higher momenta, due to an interplay with diffusive processes. Improved response functions are derived for the imulsive injection of particles near the Sun, and it is found that neglecting deceleration leads to incorrect estimates of the scattering mean free path based on the is found that neglecting decelerations leads to incorrect estimates of the scattering mean path based on the intensity decay alone, especially for lower energy particles.

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