Researchers delving into solar coronal shocks triggered by solar flares have cracked a long-standing puzzle about the reason behind the strange variation in the relative strengths of radio waves called fundamental (base note of the wave) and harmonic emissions (overtone) for different bursts.

This study was published in the Solar Physics Journal titled "Relative Strengths of Fundamental and Harmonic Emissions of Solar Radio Type II Bursts", by Rishikesh G. Jha, K. Sasikumar Raja, R. Ramesh, C. Kathiravan & Christian Monstein.

The PIB press release is here.

The DST press release is here.

The paper can be downloaded from here.