From aswfc at bom.gov.au Fri Jul 4 10:58:22 2025 From: aswfc at bom.gov.au (Australian Space Weather Forecasting Centre) Date: Fri, 04 Jul 2025 10:58:22 +1000 Subject: [Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (04 July 25) issued 0058 UT on 04 Jul 2025 [SEC=OFFICIAL] Message-ID: <6867272e.LkEvbtsW8KV3HVFF%aswfc@bom.gov.au> SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT ISSUED ON 04 JULY 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (27 JUNE - 03 JULY) Date 27 28 29 30 01 02 03 10cm 118 122 128 128 126 130 125 AFr 16 8 11 9 6 8 ( 14) Aaus 11 7 6 8 2 6 ( 12) T 74 66 74 83 81 81 85 Solar: Solar flare activity Geomagnetic: Geomagnetic activity observed for Australian region. Frequencies: Australian ionospheric F2 critical frequencies 27 Jun Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Near predicted monthly values during local day. Depressed by 25% during local night. Niue Island Region: Near predicted monthly values during local day. Depressed by 35% during local night. Depressed by 20% after local dawn. Northern Australian Region: Depressed by 15% during local day. Depressed by 35% 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. Antarctic Region (Casey/Davis/Mawson): Depressed by 45% over the UT day. 28 Jun Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Enhanced by 25% during local day. Depressed by 30% during local night. Niue Island Region: Depressed by 15% during local day. Depressed by 30% during local night. Northern Australian Region: Depressed by 20%. Southern Australian Region: Depressed by 15% during local day. Near predicted monthly values during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. 29 Jun Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Enhanced by 15% during local day. Depressed by 25% during local night. Niue Island Region: Depressed by 15% during local day. Depressed by 30% during local night. Northern Australian Region: Depressed by 15% during local day. Depressed by 30% during local night. Southern Australian Region: Depressed by 15% during local day. Depressed by 15% during local night. Depressed by 20% after local dawn. Antarctic Region (Casey/Davis/Mawson): Depressed by 15% over the UT day. 30 Jun Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Enhanced by 40% during local day. Depressed by 25% during local night. Niue Island Region: Depressed by 25% during local day. Enhanced by 25% during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 15% during local night. Southern Australian Region: Near predicted monthly values during local day. Depressed by 15% during local night. Antarctic Region (Casey/Davis/Mawson): Depressed by 15% over the UT day. 01 Jul Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Near predicted monthly values during local day. Depressed by 25% during local night. Depressed by 20% after local dawn. Niue Island Region: Near predicted monthly values during local day. Depressed by 35% during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 25% during local night. Depressed by 20% after local dawn. Southern Australian Region: Near predicted monthly values during local day. Depressed by 20% during local night. Antarctic Region (Casey/Davis/Mawson): Depressed by 20% over the UT day. 02 Jul Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Enhanced by 20% during local day. Depressed by 25% during local night. Niue Island Region: Depressed by 20% during local day. Depressed by 20% during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 20% during local night. Southern Australian Region: Depressed by 15% during the local day to near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Depressed by 15% over the UT day. 03 Jul Solar: R0 Geomagnetic: G0 Frequencies: Cocos Island Region: Near predicted monthly values during local day. Depressed by 35% during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Depressed by 25% after local dawn. Northern Australian Region: Near predicted monthly values during local day. Depressed by 25% during local night. Depressed by 25% after local dawn. Southern Australian Region: Near predicted monthly values during local day. Depressed by 25% during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Comment:Australian regional MUFs have been generally lower than predicted monthly values this week with degraded HF conditions during local night hours. Solar flare activity has been at R0 for the past week with no significant flare activity. 2. FORECAST (04 JULY - 10 JULY) Solar: R0-R1 Geomagnetic: G0, chance G1 on 4-5 Jul. G1 chance G2 at times during 8-9 Jul due to 27 recurrence pattern of southward interplanetary magnetic field conditions. G0 on other days. Frequencies: Southern Australian MUFs briefly mildly depressed after local dawn on 5-Jul and mildly to moderately depressed on 9-Jul. MUFs near predicted monthly values on other days. 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