Solar activity on UT day 11-Dec is expected to be at the R1-R2 level. S0 solar radiation storm conditions are expected. The solar wind speed is expected to be Moderate to strong over the UT day. G1-G2 geomagnetic conditions are expected. HF radio propagation conditions are expected to be fair-normal across the Australian region. Maximum usable frequencies (MUFs) in the Australian region are expected to be near predicted monthly values.