[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (31 July 26) issued 0303 UT on 31 Jul 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 31 JULY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (24 JULY - 30 JULY)
Date     24    25    26    27    28    29    30
10cm    150   145   148   147   143   143   152
AFr       9     6     8     7    10     6  (  7)
Aaus      3     3     2     3     5     2  (  1)
T        83    78    85    77    88    93    85

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

24 Jul 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 15% 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):
      Depressed by 15% over the UT day.

25 Jul 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      No data available during local day.
      No data available 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.

26 Jul 
Solar:        R1, with an M3.2 at 1528UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available 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.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

27 Jul 
Solar:        R1, with an M1.0 at 0243UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

28 Jul 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Enhanced by 15% during local day and night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

29 Jul 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

30 Jul 
Solar:        R1, with an M1.9 at 1700UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values 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.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

 
2. FORECAST (31 JULY - 06 AUGUST)
Solar: 
Solar flare activity is expected to be at the R0-R1 level over
31-Jul to 01-Aug, due to the large number of sunspot regions
on the disk. This will decrease to R0, with a chance of R1,  
over all other days this week as several of these regions 
rotate off the front side of the disk.

Geomagnetic:  
G0 geomagnetic conditions are forecast for 31-Jul G2-G3
conditions are forecast over 01-02 Aug due to the glancing
impact of a CME first observed on 30-Jul. G0, with a chance 
of G1 conditions are forecast on 03-Aug as these effects 
subside, with G0 forecast on all other days this week.

Frequencies:  
Maximum Usable Frequencies (MUFs) in the Australian region 
are forecast to become depressed over 02-03 Aug due to 
forecast geomagnetic activity, with 15-20% depressions
forecast. 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