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The Sun is an active source of radio emission which is often associated withenergetic phenomena such as solar flares and coronal mass ejections (CMEs). Atlow radio frequencies (<100 MHz), the Sun has not been imaged extensivelybecause of the instrumental limitations of previous radio telescopes. Here, thecombined high spatial, spectral and temporal resolution of the Low FrequencyArray (LOFAR) was used to study solar Type III radio bursts at 30-90 MHz andtheir association with CMEs. The Sun was imaged with 126 simultaneoustied-array beams within 5 solar radii of the solar centre. This method offersbenefits over standard interferometric imaging since each beam produces hightemporal (83 ms) and spectral resolution (12.5 kHz) dynamic spectra at an arrayof spatial locations centred on the Sun. LOFAR's standard interferometricoutput is currently limited to one image per second. Over a period of 30minutes, multiple Type III radio bursts were observed, a number of which werefound to be located at high altitudes (4 solar radii from the solar center at30 MHz) and to have non-radial trajectories. These bursts occurred at altitudesin excess of values predicted by 1D radial electron density models. Thenon-radial high altitude Type III bursts were found to be associated with theexpanding flank of a CME. The CME may have compressed neighbouring streamerplasma producing larger electron densities at high altitudes, while thenon-radial burst trajectories can be explained by the deflection of radialmagnetic fields as the CME expanded in the low corona.

LOFAR tied-array imaging of Type III solar radio bursts