Scintillations of cosmic radio sources in the decametre waveband. I - Spectra of scintillations due to ionospheric and interplanetary plasma fluctuations and the possibility of their separation. remnants of the Crab Nebula and Cassiopeia A

Details Scintillations of cosmic radio sources in the decametre waveband. I - Spectra of scintillations due to ionospheric and interplanetary plasma fluctuations and the possibility of their separation. remnants of the Crab Nebula and Cassiopeia A Scintillations of cosmic radio sources in the decametre waveband. I - Spectra of scintillations due to ionospheric and interplanetary plasma fluctuations and the possibility of their separation. remnants of the Crab Nebula and Cassiopeia A

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..79..165b&link_type=abstract

Astrophysics and Space Science, vol. 79, no. 1, Sept. 1981, p. 165-180.

Astronomy and Astrophysics

Astronomy

6

Decametric Waves, Ionospheric Propagation, Power Spectra, Radio Sources (Astronomy), Scintillation, Space Plasmas, Supernova Remnants, Cassiopeia A, Crab Nebula, Solar Wind Velocity, Spectrum Analysis

Scientific paper

The effect of fluctuations of the interplanetary plasma and the ionosphere upon the scintillation spectra of radio sources at decametre waves is considered with due regard for the finite antenna aperture, fluctuation anisotropy, and the direction of their drift in space. It has been shown that scintillation due to interplanetary plasma (IPP), can be reliably separated from the ionospheric scintillation background at decametre wavelengths. For elongations between 90° to 150°, the IPP scintillation power spectrum observed in the 12.6-25 MHz waveband is of a power law form with the index 3.1 ± 0.6, which is in close agreement with the values known for smaller elongations. The solar wind velocity projection orthogonal to the line of sight is estimated for elongations about 1 10~ and has been found to be 300 ± 80 km s~1. As in the case of smaller elongations, the velocity dispersion is significant. At night, wideband spectra of ionospheric scintillations are observed in the decametre band, with the breaking point at approximately 0.01 Hz in the 12 m band, and narrow-band spectra whose cut-off frequency is below 0.01 Hz. The power spectrum of ionospheric scintillations is of a power-law form with the index 3.4 ± 0.5. In some cases steeper spectra are observed

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