... About ATNF overview . ... Parkes radio telescope . ... Figure 7: Bursty Langmuir wave fields observed as a function of position in the solar wind ( D f < 0) and in Earth's foreshock ( D f > 0) during the period 0820 - 0955 UT on 1 December 1977 (Cairns et al. ... This provides a prima facie argument that SGT may well be relevant, rather than relying on weaker arguments based upon the analogies between type III bursts and the foreshock waves and the success of SGT at explaining type III bursts. ...