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Unified Models of Turbulence and Nonlinear Wave Evolution in the Extended Solar Corona and Solar WindThe PI (Cranmer) and Co-I (A. van Ballegooijen) made substantial progress toward the goal of producing a unified model of the basic physical processes responsible for solar wind acceleration. The approach outlined in the original proposal comprised two complementary pieces: (1) to further investigate individual physical processes under realistic coronal and solar wind conditions, and (2) to extract the dominant physical effects from simulations and apply them to a 1D model of plasma heating and acceleration. The accomplishments in Year 2 are divided into these two categories: 1a. Focused Study of Kinetic Magnetohydrodynamic (MHD) Turbulence. lb. Focused Study of Non - WKB Alfven Wave Rejection. and 2. The Unified Model Code. We have continued the development of the computational model of a time-study open flux tube in the extended corona. The proton-electron Monte Carlo model is being tested, and collisionless wave-particle interactions are being included. In order to better understand how to easily incorporate various kinds of wave-particle processes into the code, the PI performed a detailed study of the so-called "Ito Calculus", i.e., the mathematical theory of how to update the positions of particles in a probabilistic manner when their motions are governed by diffusion in velocity space.
Document ID
20040031816
Acquisition Source
Headquarters
Document Type
Contractor or Grantee Report
Authors
Cranmer, Steven R.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Wagner, William
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
February 1, 2004
Subject Category
Solar Physics
Report/Patent Number
Rept-2
Funding Number(s)
CONTRACT_GRANT: NAG5-11913
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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