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.
Whilst the frequency range of this instrument is much less than the Culgoora Radiospectrograph, the data provides SWS and other similar organizations, with extended coverage of solar radio activity, as the Culgoora Observatory is located in eastern Australia, and the Learmonth Observatory is located in western Australia. Learmonth Observatory is jointly operated by the United States Airforce and SWS. See the document A Brief Introduction of Radiospectrogram Analysis for more information about spectrogram events.