[Ips-whfpr] ASWFC Weekly Prop. Report (23 April 25) issued 0034 UT on 23 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY HF PROPAGATION REPORT
ISSUED ON 23 APRIL 2025 
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (16 APRIL - 22 APRIL)
Date   T index   Conditions        
16 Apr  102      Fair              
MUFS:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

17 Apr   99      Fair              
MUFS:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Enhanced by 35% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 25% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

18 Apr  116      Fair-normal       
MUFS:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Enhanced by 25%.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
      Hobart depressed 15-20% after dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

19 Apr  121      Fair-normal       
MUFS:
   Cocos Island Region:
      Enhanced by 40% during local day.
      Enhanced by 25% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values.
      Hobart 15-25% depressed after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

20 Apr  103      Fair-normal       
MUFS:
   Cocos Island Region:
      Enhanced by 35% during local day.
      Near predicted monthly values 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 20% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Hobart MUFs depressed 15-30%.
      Depressed by 15-30% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

21 Apr  105      Normal-fair       
MUFS:
   Cocos Island Region:
      Near predicted monthly values.
   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 during local day.
      Depressed by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

22 Apr  113      Normal-fair       
MUFS:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 75% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

Predicted Monthly T index for April: 115

2. FORECAST (23 APRIL - 29 APRIL) 
MUFS: mostly near predicted values but
depressions of 10-20% are possible,
especially in the southern regions during local
night hours over 23-26 Apr due to coronal hole
activity. 

Propagation conditions: Fluctuating normal
to fair in line with geomagnetic activity over 23-25
Apr. Worse conditions expected at high latitudes. 

T index: 115
ASWFC SWF HF Communications Warning 41 was issued on 22 April 
and is current for 22-23 Apr.

3. OUTLOOK (30 APRIL - 30 MAY)
Degraded HF propagation conditions possible:
1-2 May,  5-6 May,  18-20 May,  

PLEASE NOTE:
Space weather conditions can frequently be determined by short 
timescale events that cannot be forecast a week in advance,
particularly at solar maximum.

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