TY - JOUR
T1 - Incoherent scatter spectral theories - Part II
T2 - Modeling the spectrum for modes propagating perpendicular to B
AU - Milla, Marco A.
AU - Kudeki, Erhan
N1 - Funding Information:
The authors would like to thank the University of Illinois for the use of the Turing Cluster, which is maintained and operated by the Computational Science and Engineering Program of the university. Turing is a 1536-processor Apple G5 Xserve cluster devoted to high-performance computing in engineering and science.
Funding Information:
Manuscript received March 30, 2009; revised November 26, 2009 and April 20, 2010; accepted June 13, 2010. Date of publication October 7, 2010; date of current version December 27, 2010. This work was supported by the University of Illinois, Urbana, under Grant ATM-0215246 from the National Science Foundation.
PY - 2011/1
Y1 - 2011/1
N2 - Incoherent scatter (IS) spectral models for collisional and magnetized F-region plasmas are developed based on a general framework described in part I of this paper and on the statistics of simulated particle trajectories. In the simulations, a Langevin update equation is used to describe the motion of charge carriers undergoing Coulomb collisions. It is shown that random displacements of oxygen ions in the F-region can be characterized as a Brownian-motion process with Gaussian distributed displacement vectors. Electron displacements, on the other hand, are non-Brownian, and their statistics exhibit a dependence on the magnetic aspect angle. A numerical library of characteristic functions of electron displacements was constructed from the simulation data obtained for a set of plasma parameters typical of the equatorial F-region. Spectral models for the IS radar signals from F-region heights are constructed with one-sided Fourier transforms of the characteristic functions of electron and ion displacements. The models are valid at all magnetic aspect angles, including the zero aspect angle that corresponds to radar observations perpendicular to the ambient geomagnetic field B.
AB - Incoherent scatter (IS) spectral models for collisional and magnetized F-region plasmas are developed based on a general framework described in part I of this paper and on the statistics of simulated particle trajectories. In the simulations, a Langevin update equation is used to describe the motion of charge carriers undergoing Coulomb collisions. It is shown that random displacements of oxygen ions in the F-region can be characterized as a Brownian-motion process with Gaussian distributed displacement vectors. Electron displacements, on the other hand, are non-Brownian, and their statistics exhibit a dependence on the magnetic aspect angle. A numerical library of characteristic functions of electron displacements was constructed from the simulation data obtained for a set of plasma parameters typical of the equatorial F-region. Spectral models for the IS radar signals from F-region heights are constructed with one-sided Fourier transforms of the characteristic functions of electron and ion displacements. The models are valid at all magnetic aspect angles, including the zero aspect angle that corresponds to radar observations perpendicular to the ambient geomagnetic field B.
KW - Fokker-Planck collision model
KW - Langevin equation
KW - incoherent scatter (IS)
KW - remote sensing
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U2 - 10.1109/TGRS.2010.2057253
DO - 10.1109/TGRS.2010.2057253
M3 - Article
AN - SCOPUS:78650911967
SN - 0196-2892
VL - 49
SP - 329
EP - 345
JO - IEEE Transactions on Geoscience and Remote Sensing
JF - IEEE Transactions on Geoscience and Remote Sensing
IS - 1 PART 2
M1 - 5595001
ER -