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The Sun's corona has interested researchers for multiple reasons, includingthe search for solution for the famous coronal heating problem and a purelypractical consideration of predicting geomagnetic storms on Earth. There existnumerous different theories regarding the solar corona; therefore, it isimportant to be able to perform comparative analysis and validation of thosetheories. One way that could help us move towards the answers to those problemsis the search for observational methods that could obtain information about thephysical properties of the solar corona and provide means for comparingdifferent solar corona models.  In this work we present evidence that VLBI observations are, in certainconditions, sensitive to the electron density of the solar corona and are ableto distinguish between different electron density models, which makes thetechnique of VLBI valuable for solar corona investigations. Recent works on thesubject used a symmetric power-law model of the electron density in solarplasma; in this work, an improvement is proposed based on a 3D numerical model.

Exploring the Asymmetry of the Solar Corona Electron Density with Very Long Baseline Interferometry