[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (21 August 26) issued 0130 UT on 21 Aug 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 21 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (14 AUGUST - 20 AUGUST)
Date     14    15    16    17    18    19    20
10cm    114   117   129   124   125   126   125
AFr      12     6     0    19    20    15  ( 10)
Aaus      7     2     1     4    14    12  (  7)
T        56    54    62    63    77    71    73

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

14 Aug 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 45% 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.

15 Aug 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   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.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

16 Aug 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Niue Island Region:
      Near predicted monthly values.
   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.

17 Aug 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

18 Aug 
Solar:        R0
Geomagnetic:  G1
Frequencies:  
   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.

19 Aug 
Solar:        R0
Geomagnetic:  G0
In the BOM magnetometer data for 19 Aug, a weak (8nT) impulse 
was observed at 0421UT.
Frequencies:  
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

20 Aug 
Solar:        R2, with an M1.8 at 0805UT, an M8.1 at 1142UT, 
              and an M2.9 at 1611UT
Geomagnetic:  G0
Frequencies:  
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

 
2. FORECAST (21 AUGUST - 27 AUGUST)
Solar: 
Solar flare activity is expected to be at R1-R2 levels this week
due to the observed flare activity from Active Region (AR) 4513.

Geomagnetic:  
G0 planetary geomagnetic conditions are expected this week.

Frequencies:  
MUFs are expected to be near predicted monthly values this week.
Shortwave fadeouts are probable. 

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