Solar flare activity on UT day 23-Oct is expected to be at the R0 level, with a chance of R1. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be moderate, declining over the UT day. G0 geomagnetic conditions are expected. Global high frequency radio propagation conditions are expected to be fair to normal. Maximum Usable Frequencies (MUFs) in the Australian region are expected to be mostly near predicted monthly values, with mild depressions possible in the southern Australian region.