[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (03 October 25) issued 0109 UT on 03 Oct 2025 [SEC=OFFICIAL]

Fri Oct 3 11:09:08 AEST 2025

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 03 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (26 SEPTEMBER - 02 OCTOBER)
Date     26    27    28    29    30    01    02
10cm    165   164   171   186   187   184   167
AFr       6     5     9    13    43    25  ( 36)
Aaus      3     3     8    19    33    22  ( 21)
T       119   130   136   130    88    96   104

Solar:        Solar flare activity
Geomagnetic:  Geomagnetic activity observed for Australian region.
Frequencies:  Australian ionospheric F2 critical frequencies

26 Sep 
Solar:        R1, with an M1.6 at 2001UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 25% during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 45% 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:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
      Enhanced by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

27 Sep 
Solar:        R1, with an M1.0 at 0401UT, and an M1.1 at 
              0714UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 30% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 50% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 25% during local night.
      Enhanced by 35% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 20% over the UT day.

28 Sep 
Solar:        R2, with an M6.4 at 0843UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 45% during local day.
      Enhanced by 65% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 50% during local night.
      Enhanced by 25% after local dawn.
   Southern Australian Region:
      Enhanced by 25% during local day.
      Enhanced by 30% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

29 Sep 
Solar:        R1, with an M3.6 at 0145UT, an M1.0 at 1115UT, 
              an M1.1 at 1139UT, and an M1.0 at 1159UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Enhanced by 20-30%.
   Northern Australian Region:
      Enhanced by 15-25%.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Depressed by 15-30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

30 Sep 
Solar:        R1, with an M1.2 at 0056UT, an M2.6 at 0940UT, 
              and an M1.8 at 1227UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
      Enhanced by 45% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

01 Oct 
Solar:        R1, with an M1.2 at 0226UT, and an M1.2 at 
              1650UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 20% during local night.
      Enhanced by 30% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 20% during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

02 Oct 
Solar:        R1, with an M1.2 at 0209UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Enhanced by 40% during local day.
      Enhanced by 30% during local night.
      Enhanced by 30% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

2. FORECAST (03 OCTOBER - 09 OCTOBER)
Solar: 
R0-R1, chance R2

Geomagnetic:  
G0-G1, chance of G2 early in the week, dropping the chance of G2 by mid-week. 
G0 by late week.

Frequencies:  
Maximum usable frequencies (MUFs) depressed up to 30 early in the
week,recovering
by mid-week. MUF enhancements possible by late week. 

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