[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (20 June 25) issued 0111 UT on 20 Jun 2025 [SEC=OFFICIAL]

Fri Jun 20 11:11:18 AEST 2025

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 20 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (13 JUNE - 19 JUNE)
Date     13    14    15    16    17    18    19
10cm    143   151   161   148   139   137   136
AFr      66    24     0     0     0    12  ( 11)
Aaus     22    13     7     6     5     6  (  7)
T       104    65    64    76    85    93    87

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

13 Jun 
Solar:        R1, with an M1.2 at 2111UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 70% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced 20% after local dawn.
   Southern Australian Region:
      Depressed 25% during the local day.
      Depressed by 30% all day at Hobart.
      Generally near predicted values during the local night.
      Depressed 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 45% over the UT day.
      Strong spread F and sporadic E.

14 Jun 
Solar:        R2, with an M1.0 at 1804UT, and an M6.8 at 2301UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15-30% during local night.
   Southern Australian Region:
      Depressed by 30-35%.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 50% over the UT day.
      Strong spread F and sporadic E.

15 Jun 
Solar:        R2, with an M2.2 at 0756UT, an M1.9 at 
              1047UT, and an M8.4 at 1807UT and an M1.2
              at 2357UT.
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values 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 40% during local night.
   Southern Australian Region:
      Depressed by 35%.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

16 Jun 
Solar:        R2, with an M1.8 at 0423UT, an M6.4 at 
              0938UT, an M1.4 at 1139UT, and an M1.1 
              at 1455UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 35% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

17 Jun 
Solar:        R3, with an X1.2 at 2149UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 20% during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 40% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
      Depressed by 25% after local dawn.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

18 Jun 
Solar:        R1, with an M1.5 at 0000UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 15% during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   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 20% over the UT day.

19 Jun 
Solar:        R3, with an X1.9 at 2350UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 10-20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.
      Frequent spread F and sporadic E.

Comment: The R3 X1.9 flare on 19-Jun was an impulsive
short duration flare from solar region AR4114 which is
in decay. 

2. FORECAST (20 JUNE - 26 JUNE)
Solar: 
R1, chance R2. A previously flaring region may 
return on 21-Jun.

Geomagnetic:  
G0, chance G1 periods on 20-Jun. Geomagnetic 27 day 
recurrence implies G1 periods are likely during the interval
24-26 Jun. G0 on other days of the week.

Frequencies:  
MUFs briefly 10-15% depressed after local dawn on 20-Jun for the 
southern Australian region. Southern Australian region MUFs may 
again become 15% depressed during the 25-27 Jun in association 
with recurrent geomagnetic activity. MUFs are expected to be 
near predicted monthly values on other days of the 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