Density gradients in the solar plasma observed by interplanetary scintillation

Details Density gradients in the solar plasma observed by interplanetary scintillation Density gradients in the solar plasma observed by interplanetary scintillation

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..209g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 209-216.

Astronomy and Astrophysics

Astronomy

12

Interplanetary Medium, Plasma Density, Scintillation, Solar Wind, Fresnel Lenses, Line Of Sight, Power Spectra, Time Lag

Scientific paper

A new technique is described which overcomes the limitation set by Fresnel filtering in previous IPS studies of the small-scale density irregularities in the solar plasma. Phase gradients introduced by irregularities larger than the Fresnel limit cause transverse displacements of the small-scale scintillation pattern. In the presence of the solar wind, such refraction effects may be revealed by simultaneous measurements of intensity scintillation at two radio frequencies. Observations show that the structure corresponding to temporal frequencies of about 0.02 Hz is in agreement with an extrapolation of the Kolmogorov spectrum derived from spacecraft data at lower frequencies.

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