Density power spectrum in the local interstellar medium

Details Density power spectrum in the local interstellar medium Density power spectrum in the local interstellar medium

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.291..561a&link_type=abstract

Nature, vol. 291, June 18, 1981, p. 561-564. Research supported by the California Institute of Technology

Astronomy and Astrophysics

Astronomy

141

Density Distribution, Electron Density (Concentration), Interstellar Matter, Power Spectra, Interstellar Gas, Pulsars, Radio Astronomy, Radio Scattering, Radio Sources (Astronomy), Scintillation, Velocity Distribution, Very Long Base Interferometry

Scientific paper

Observational evidence is presented for the existence of interstellar medium electron density irregularities over a wide range of scale sizes. Radio scattering observations associated with the wavenumber range of about 10 to the -11th to 10 to the -6th/m are consistent with a density spectrum of the wavenumber form -3.7 + or - 0.6. At lower spatial wavenumbers (10 to the -16th to 10 to the -18th/m) the power spectrum can be estimated by (1) computation of the density fluctuations near the outer scale of the spectrum, (2) comparison with density irregularities predicted by theoretical models of the interstellar medium, and (3) comparison with observations of the velocity structure function.

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