The Culgoora Solar Radio Spectrograph observes the radio emmission of the Sun from 18MHz to 1.8GHz. This is required as solar flares can radiate energy over a very broad frequency range. Solar flare radio activity appear as “sweeps” on a solar radio spectrograph display. In particular, there are two types of “sweeps” known as “Type II” and “Type IV”, which can indicate that a solar coronal mass ejection has occurred.
The Learmonth Solar Radio Spectrograph observes the radio emmission of the Sun from 25 MHz to 180 Mhz. Solar radio spectrograph display radio bursts or “sweep” events. These are classified into particular types. A “Type II” spectral burst is believed to be due to plasma emmission that occurs following the passage of a shock wave through the corona, usually associated with a solar flare. This information can be used to try and predict the arrival time of the shock at the Earth, and the possible onset of geomagnetic storm activity.