Dynamic spectra of some terrestrial ionospheric effects at decametric wavelengths - Applications in other astrophysical contexts

Details Dynamic spectra of some terrestrial ionospheric effects at decametric wavelengths - Applications in other astrophysical contexts Dynamic spectra of some terrestrial ionospheric effects at decametric wavelengths - Applications in other astrophysical contexts

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....96..296m&link_type=abstract

Astronomy and Astrophysics, vol. 96, no. 1-2, Mar. 1981, p. 296-301.

Astronomy and Astrophysics

Astrophysics

13

Ionospheric Propagation, Jupiter (Planet), Planetary Radiation, Radio Sources (Astronomy), Radio Spectra, Solar Radio Emission, Traveling Ionospheric Disturbances, Cosmic Plasma, Decametric Waves, Gravity Waves, Io, Scintillation, Toroidal Plasmas, Visibility, Jupiter, Dynamics, Spectrum, Ionosphere, Decameter Waves, Wavelengths, Perturbations, Radioemissions, Phase Changes, Astrophysics, Bursts, Io, Scintillations, Plasma Torus, Observations, Theoretical Studies, Models, Data, Parameters, Comparisons, Sour

Scientific paper

Ionospheric perturbations in the dynamic spectra of solar and Jovian radio emission in the decametric range are examined. A theoretical interpretation is given in terms of focusing and diffraction by large-scale ionospheric inhomogeneities, which are quasi-periodic travelling disturbances producing large phase changes. The model takes into account the source size and shows that different effects are to be expected and observed for the emissions of the sun and Jupiter. It also predicts the corresponding effects on the measurements of the source's visibility. The theory has few free parameters, uses typical values and does not introduce ad-hoc hypotheses. It is suggested that similar effects could account for some broadband interplanetary scintillations observed recently and that propagation effects through the Jovian plasma torus could serve to explain unexplained features of the Jovian radio emission.

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