A mathematical analysis of the theory of interplanetary scintillation in the weak scattering approximation

Details A mathematical analysis of the theory of interplanetary scintillation in the weak scattering approximation A mathematical analysis of the theory of interplanetary scintillation in the weak scattering approximation

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5071m&link_type=abstract

Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 5071-5082. Research supported by the University of New Hampshire

Astronomy and Astrophysics

Astronomy

2

Interplanetary Medium, Mathematical Models, Radio Scattering, Radio Sources (Astronomy), Scintillation, Anisotropic Media, Approximation, Convergence, Electron Density (Concentration), Hypergeometric Functions, Power Spectra, Series (Mathematics)

Scientific paper

A simplified analytical technique is presented for modeling the interplanetary scintillation of radio sources of finite angular size with a power-law electron-density-fluctuation power spectrum. The simplification results from the representation of the scintillation spectrum in confluent hypergeometric functions. The approximations presented allow fast numerical evaluation of a spectrum for a weakly scattering but extended medium with less than 10% error over the entire spectrum. Parameters describing anisotropic electron irregularities as well as anisotropic source structure are included, and the dependence of the spectrum normalization on the scales of the medium is derived explicitly. The parametric description of the domains of convergence of the approximate expansions also provides a simple conceptualization of the relative contributions of the scattered radiation along the line of sight to the observed spectrum. This is particularly useful for sources of finite angular size. This technique is applied to previously published observations.

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