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We use multi-spacecraft observations of invididual type III radio bursts inorder to calculate the directivity of the radio emission, to be compared to theresults of ray-tracing simulations of the radio-wave propagation and probe theplasma properties of the inner heliosphere. Ray-tracing simulations ofradio-wave propagation with anisotropic scattering on density inhomogeneitiesare used to study the directivity of radio emissions. Simultaneous observationsof type III radio bursts by four widely-separated spacecraft are used tocalculate the directivity and position of the radio sources. The shape of thedirectivity pattern deduced for individual events is compared to thedirectivity pattern resulting from the ray-tracing simulations. We show thatsimultaneous observations of type radio III bursts by 4 different probesprovide the opportunity to estimate the radio source positions and thedirectivity of the radio emission. The shape of the directivity varies from oneevent to another, and is consistent with anisotropic scattering of theradio-waves.

astronomy and astrophysics

Simulations of radio-wave anisotropic scattering to interpret type III  radio bursts measurements by Solar Orbiter, Parker Solar Probe, STEREO and  Wind