(Courtesy of the Nobeyama Radio Telescope Facility)

About the images:

Electrons in the solar corona spiral around magnetic field lines. When the electron is moving very rapidly (at a significant fraction of the speed of light) it emits radiation called "synchtotron radiation" at radio frequencies. The radiation is emitted preferentially in one direction and is therefore linearly polarized. Electrons accelerated by electric fields in flares produce intense bursts of radio emissions.

What to look for:

Solar active regions and flares are bright in radio emissions.