We report ground based , low frequency heliograph ( 80 MHz ) , spectral ( 85-35 MHz ) and polarimeter ( 80 and 40 MHz ) observations of drifting , non-thermal radio continuum associated with the ‘ halo ’ coronal mass ejection ( CME ) that occurred in the solar atmosphere on 2013 March 15 .
The magnetic field strengths ( B ) near the radio source were estimated to be B \approx 2.2 \pm 0.4 G at 80 MHz and B \approx 1.4 \pm 0.2 G at 40 MHz .
The corresponding radial distances ( r ) are r \approx 1.9 ~ { } R _ { \odot } ( 80 MHz ) and r \approx 2.2 ~ { } R _ { \odot } ( 40 MHz ) .