[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (15 August 25) issued 0236 UT on 15 Aug 2025 [SEC=OFFICIAL]

Fri Aug 15 12:36:46 AEST 2025

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 15 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (08 AUGUST - 14 AUGUST)
Date     08    09    10    11    12    13    14
10cm    148   140   153   146   152   140   130
AFr      18    27    17     0    14    15  ( 10)
Aaus     13    23    15    10     9    11  (  6)
T        82   107    95    79    91    88    91

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

08 Aug 
Solar:        R1, with an M2.8 at 0353UT, and an M1.0 at 
              1910UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Depressed by 20% during local day.
      Depressed by 30% 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.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

09 Aug 
Solar:        R1, with an M1.6 at 1621UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Enhanced by 20% during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

10 Aug 
Solar:        R1, with an M1.7 at 0312UT, an M2.2 at 1507UT, 
              and an M1.7 at 2305UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 15% during local day.
      Depressed by 15% during local night.
      Enhanced by 30% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

11 Aug 
Solar:        R1, with an M1.7 at 2305UT, an M1.3 at 0352UT, 
              an M1.5 at 1435UT, and an M1.6 at 1536UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Enhanced by 35% during local day.
      Enhanced by 40% 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 local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

12 Aug 
Solar:        R1, with an M1.5 at 0059UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

13 Aug 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 15% 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):
      Near predicted monthly values over the UT day.

14 Aug 
Solar:        R0
Geomagnetic:  R0
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% 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.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

2. FORECAST (15 AUGUST - 21 AUGUST)
Solar: 
Solar activity over 15-21 Aug is expected to be at the R0 level
with a chance of R1.

Geomagnetic:  
G0 geomagnetic conditions are expected over 15-17 Aug. G0-G1
conditions are expected over 18-21 Aug due to anticipated 
coronal hole high speed wind stream effects.

Frequencies:  
MUFs are expected to be near predicted monthly values over
15-17 Aug. MUFs are expected to be near predicted monthly 
values to 15% depressed over 18-21 Aug. Due to anticipated 
geomagnetic activity. Depressions are expected to be mostly 
in the southern Australian region

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