IIA Institutional Repository

Browsing by Subject "Statistical Analysis"

Browsing by Subject "Statistical Analysis"

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  • Effects of partial frequency redistribution on the level population densities in a resonance line 
    Peraiah, A; Rao, D. M (D. Reidel Publishing Co., 1981-12)
    We have obtained a simultaneous solution of the statistical equilibrium equation for a non-LTE two-level atom and the radiative transfer equation in the comoving frames by employing the angle-averaged partial frequency ...
  • Effects of redistribution with dipole scattering on line source functions 
    Peraiah, A; Rangarajan, K. E (Indian Academy of Sciences, 1981-09)
    The partial frequency redistribution function for zero natural line width and dipole scattering is used to obtain a simultaneous solution of the statistical equilibrium and line transfer equations in the comoving frame of ...
  • Patchy occurrence of equatorial spread-F 
    Sastri, J. H (European Geosciences Union, 1985-10)
    From a statistical analysis of ionogram data of Kodaikanal (dip 3.5 deg N) it is shown that, during years of high sunspot activity, the discontinuous or patchy occurrence of equatorial spread-F (ESF) depends on season. ...
  • Time variability of the He I 10830 A line profile 
    Singh, J; Jain, S. K; Venkatakrishnan, P (Springer, 1994-03)
    We have studied the time-dependent behavior of the He I 10830 A line. These studies show that (1) the fluctuations of the line width are uncorrelated with the equivalent-width fluctuations and (2) the autocorrelation curves ...

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