Solar flare activity on UT day 04-Oct is expected to be at the R0 level. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be light to moderate, increasing over the UT day. G1 geomagnetic conditions are expected. Global high frequency radio propagation conditions are expected to be normal to fair. Maximum Usable Frequencies (MUFs) in the Australian region are expected to be depressed by 10-15% compared with predicted monthly values.