[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (28 March 25) issued 0047 UT on 28 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 28 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (21 MARCH - 27 MARCH)
Date     21    22    23    24    25    26    27
10cm    165   178   168   156   156   152   153
AFr      16    20     9    18    13    26  ( 23)
Aaus     16    16     5    12    15    23  ( 18)
T       151   152   133   148   130   113   120

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

21 Mar 
Solar:        R1, with an M1.2 at 1558UT
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 35% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 30% during local night.
   Southern Australian Region:
      Enhanced by 15%.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

22 Mar 
Solar:        R0
Geomagnetic:  G0 (G2 planetary for one period)
Frequencies:  
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 45% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 40% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

23 Mar 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Enhanced 30% early in UT day then near predicted monthly values.
   Southern Australian Region:
      Enhanced 30% early in UT day then near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

24 Mar 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Enhanced by 20% during local day.
      Enhanced by 55% during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

25 Mar 
Solar:        R0
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
      Enhanced by 50% after local dawn.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 35% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

26 Mar 
Solar:        R1, with an M1.0 at 0810UT
Geomagnetic:  G1 (G2 planetary for three K index periods)
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Depressed by 20%.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

27 Mar 
Solar:        R1, with an M2.0 at 0037UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 35% after local dawn.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 50% during local night.
   Northern Australian Region:
      Depressed 15% to near predicted monthly values.
      Enhanced 15% after local dawn.
   Southern Australian Region:
      Depressed 15% to near predicted monthly values.
      Depressed 15% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 40% over the UT day.

Comment: The Earth entered a solar coronal hole wind stream 
on 26-Mar. Increased geomagnetic activity was observed 26-28 Mar.
The middle latitude Australian regional ionosphere was 15-20%
depressed on 26-27 Mar. Two isolated solar flares toward the end
of the week were from solar region AR4043 currently in the 
northeast solar quadrant.

 
2. FORECAST (28 MARCH - 03 APRIL)
Solar: 
R0-R1. A region in the northeast solar quadrant may produce 
further isolated R1 flares in the coming week. A new solar region 
is currently rotating onto the solar disk at solar latitude
N03. Other on disk regions are very small.
 
Geomagnetic:  
G0-G1 activity on 28-Mar due to a solar coronal hole wind
stream. G0 on other days.

Frequencies:  
MUFs briefly depressed after local dawn on 28-Mar for
the southern Australian region. 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