From aswfc at bom.gov.au Wed Dec 3 13:03:52 2025 From: aswfc at bom.gov.au (Australian Space Weather Forecasting Centre) Date: Wed, 03 Dec 2025 13:03:52 +1100 Subject: [Ips-whfpr] ASWFC Weekly Prop. Report (03 December 25) issued 0203 UT on 03 Dec 2025 [SEC=OFFICIAL] Message-ID: <692f9a88.L0/AWFqiwh0z3yeK%aswfc@bom.gov.au> SUBJ: ASWFC WEEKLY HF PROPAGATION REPORT ISSUED ON 03 DECEMBER 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE AUSTRALIAN REGION SUMMARY AND FORECAST 1. SUMMARY (26 NOVEMBER - 02 DECEMBER) Date T index Conditions 26 Nov 73 Fair MUFS: Cocos Island Region: Mostly near predicted monthly values. Enhanced by 20% after local dawn. Niue Island Region: Enhanced by 20% during local day. Enhanced by 20% during local night. Northern Australian Region: Depressed by 15% during local day. Near predicted monthly values during local night. Depressed by 30% after local dawn. Southern Australian Region: Depressed by 15% during local day. Near predicted monthly values during local night. Depressed by 20% after local dawn. Antarctic Region (Casey/Davis/Mawson): Depressed by 15% over the UT day. 27 Nov 91 Normal-fair MUFS: Cocos Island Region: Near predicted monthly values. Niue Island Region: Near predicted monthly values during local day. Enhanced by 40% during local night. Enhanced by 20% after local dawn. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Southern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. 28 Nov 94 Normal-fair MUFS: Cocos Island Region: Mostly near predicted monthly values. Niue Island Region: Enhanced by 20-25%. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Depressed 15-20% after local dawn. Southern Australian Region: Mostly near predicted monthly values. Depressed 20-30% after local dawn. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. 29 Nov 93 Fair-normal MUFS: Cocos Island Region: Enhanced by 15% during local day. Near predicted monthly values during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 30% during local night. Northern Australian Region: Depressed 15-30% during the local day at Townsville and Brisbane. Near predicted monthly values at other sites. Southern Australian Region: Depressed 15% during the local day then near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. 30 Nov 98 Normal-fair MUFS: Cocos Island Region: Depressed by 15% during local day. Near predicted monthly values during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 25% during local night. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. 01 Dec 127 Normal MUFS: Cocos Island Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Niue Island Region: Enhanced by 15% during local day. Near predicted monthly values during local night. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 25% during local night. Southern Australian Region: Near predicted monthly values during local day. Enhanced by 20% during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. 02 Dec 128 Normal MUFS: Cocos Island Region: Near predicted monthly values during local day. Enhanced by 20% during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Northern Australian Region: Enhanced by 15% during local day. Enhanced by 15% during local night. Southern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Predicted Monthly T index for December: 89 2. FORECAST (03 DECEMBER - 09 DECEMBER) Maximum Usable Frequencies (MUF) are expected to be up to 15% enhanced on the 03-Dec. MUFs are expected to be near predicted monthly values over 04-06 Dec, due to geomagnetic disturbances generated by a Coronal Hole High Speed Wind Stream (CHSS). MUFs are expected to return to near predicted monthly values to 15% enhanced from the 06-09 Dec, as CHSS effects abate. Propagation conditions: HF conditions are expected to normal on the 03-Dec. Normal-fair conditions are expected in high latitude regions on the 04-Dec. Normal-fair conditions are expected on the 05-Dec. As effects from the CHSS subside, conditions will return to normal from the 06-09 Dec. SWFs are probable over the period. T index: 89 ASWFC SWF HF Communications Warning 114 was issued on 2 December and is current for 2-4 Dec. 3. OUTLOOK (10 DECEMBER - 09 JANUARY) Degraded HF propagation conditions possible: 22-27 Dec, 31 Dec to 02 Jan PLEASE NOTE: Space weather conditions can frequently be determined by short timescale events that cannot be forecast a week in advance, particularly at solar maximum. For an explanation of some of the terms in this report, go to https://www.sws.bom.gov.au, and follow links to Educational-> Glossary on Solar Terrestrial Terms. Australian Space Weather Forecasting Centre Bureau of Meteorology ASWFC at bom.gov.au www.bom.gov.au | www.sws.bom.gov.au