[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (11 April 25) issued 0055 UT on 11 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 11 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (04 APRIL - 10 APRIL)
Date     04    05    06    07    08    09    10
10cm    180   184   167   162   159   167   153
AFr      19     0    20    10    20    22  ( 12)
Aaus     17    19    14     8    14    16  (  9)
T       138   129   112   133   124   133   136

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

04 Apr 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 25% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
      Enhanced by 30% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
      Hobart MUFs 30% depressed after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 45% over the UT day.

05 Apr 
Solar:        R1, with an M1.0 at 2005UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 45% over the UT day.

06 Apr 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 15% 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:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 45% over the UT day.

07 Apr 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 45% during local night.
   Niue Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Enhanced 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):
      Depressed by 30% over the UT day.

08 Apr 
Solar:        R1, with an M1.5 at 2222UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

09 Apr 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

10 Apr 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 20-30%.
   Niue Island Region:
      Enhanced by 25-30%. 
   Northern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Hobart depressed 20-30% early in UT day.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

Comment: Mildly elevated geomagnetic activity was
observed this week due to solar coronal hole
wind streams. Southern Australian region MUFs
were depressed on 06-07 Apr in association with
this mild geomagnetic activity. Northern Australian
region MUFs remained near to 20% above predicted
monthly values.

 
2. FORECAST (11 APRIL - 17 APRIL)
Solar: 
R1,chance R2. Isolated solar flare activity is expected this
week due to two currently developing solar regions.

Geomagnetic:  
Slight chance for a G1 period 11-Apr. Geomagnetic 27 day
recurrence patterns suggest G1 conditions 17-18 Apr, with
G0 conditions expected on other days of the week.

Frequencies:  
MUFs near predicted monthly values to 15% enhanced. Isolated 
fadeouts possible on daylight HF circuits..


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