This work aims to investigate the sources of the radio emissions from the Sun using multi-spacecraft as well as ground-based beamformed and interferometric remote observations. It consists of performing spectral analysis on the dynamic spectra for multiple case studies of solar type-III radio bursts by comparing multi-viewpoint remote observations of radio bursts detected by different spacecraft. We have been exploring the influence of the relative viewpoints of the instruments on the measurements of radio burst emissions (i.e., modification by reflection, refraction, and scattering as the emission propagates through the solar corona). The figure below summarizes the results so far. This work is being prepared for submission to a peer-reviewed journal. We will also apply this analysis to automatic identification and characterization of type-III bursts in concurrent radio observations by LOFAR, the Parker Solar Probe satellite, and the Solar Orbiter satellite.
Panel 1 shows a top view of the ecliptic plane of the Sun and Earth (representing the Low-Frequency Array – LOFAR) with the Parker Solar Probe (PSP) and their overlapped field of view (FOV), for the observations on 03.04.2019. Panel 2 shows the combined raw observations of PSP (low frequencies) and LOFAR (higher frequencies). In Panel 3 the two observations have been shifted relative to each other based on the relative positions of the Earth and PSP, showing the great alignment of the type III bursts. Panel 4 shows an application of an automated burst-fitting algorithm developed for type III bursts. Panel 5 shows the derived frequency drift calculated for the first type III burst in the sequence.