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

Abstract

We use multi-spacecraft observations of invididual type III radio bursts in order to calculate the directivity of the radio emission, to be compared to the results of ray-tracing simulations of the radio-wave propagation and probe the plasma properties of the inner heliosphere. Ray-tracing simulations of radio-wave propagation with anisotropic scattering on density inhomogeneities are used to study the directivity of radio emissions. Simultaneous observations of type III radio bursts by four widely-separated spacecraft are used to calculate the directivity and position of the radio sources. The shape of the directivity pattern deduced for individual events is compared to the directivity pattern resulting from the ray-tracing simulations. We show that simultaneous observations of type radio III bursts by 4 different probes provide the opportunity to estimate the radio source positions and the directivity of the radio emission. The shape of the directivity varies from one event to another, and is consistent with anisotropic scattering of the radio-waves.

References in corpus (7)

• The Solar Orbiter mission -- Science overview
• The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
• Density Fluctuations in the Solar Wind Based on Type III Radio Bursts Observed by Parker Solar Probe
• Radio Echo in the Turbulent Corona and Simulations of Solar Drift-Pair Radio Bursts
• Sub-second time evolution of Type III solar radio burst sources at fundamental and harmonic frequencies
• Harmonic radio emission in randomly inhomogeneous plasma
• Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations

Cited by in corpus (12)

• Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
• An Anisotropic Density Turbulence Model from the Sun to 1 au Derived From Radio Observations
• Tracking a beam of electrons from the low solar corona into interplanetary space with the Low Frequency Array, Parker Solar Probe and 1 au spacecraft
• Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations
• Source positions of an interplanetary type III radio burst and anisotropic radio-wave scattering
• Solar Radio Spikes and Type IIIb Striae Manifestations of Sub-second Electron Acceleration Triggered by a Coronal Mass Ejection
• Tracing the Heliospheric Magnetic Field via Anisotropic Radio-Wave Scattering
• Observation of solar radio burst events from Mars orbit with the Shallow Radar instrument
• The frequency ratio and time delay of solar radio emissions with fundamental and harmonic components
• Temporally resolved Type III solar radio bursts in the frequency range 3-13 MHz
• Tracking solar radio bursts using Bayesian multilateration
• Coronal electron density: Insights from radio and in situ observations, and EUHFORIA modeling