The phase power spectrum of the solar wind measured by long-baseline interferometry at 81.5 MHz

Details The phase power spectrum of the solar wind measured by long-baseline interferometry at 81.5 MHz The phase power spectrum of the solar wind measured by long-baseline interferometry at 81.5 MHz

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..463r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 15, 1985, p. 463-470.

Computer Science

Sound

2

Interplanetary Medium, Radio Astronomy, Solar Wind, Very Long Base Interferometry, Power Spectra, Radio Interferometers, Satellite Sounding, Scintillation, Visibility

Scientific paper

The authors have measured the phase power spectrum of the solar wind at 81.5 MHz using an interferometer with a baseline of 130 km. A simple extrapolation of the power law observed by spacecraft at lower spatial frequencies is consistent with the authors' data, and the best-fitting power law has an index for the two-dimensional phase power spectrum of 3.3. While not ruling out the Gaussian model by Readhead, Kemp & Hewish (RKH) for spatial frequencies above 5×10-3km-1, the data suggest that the phase power in their model is too small. This is supported by the good agreement between the results and recent measurements by spacecraft. Unless the scattering power of the solar wind has changed since 1976, this implies that the interplanetary scintillation (IPS) compactness parameter, R, deduced from IPS observations using the RKH model, may be too large by up to 30 per cent.

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