[Ips-wsgr] ASWFC Weekly Solar and Geophysical Report (27 March 26) issued 0111 UT on 27 Mar 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 27 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (20 MARCH - 26 MARCH)
Date     20    21    22    23    24    25    26
10cm    102   107   120   124   128   140   152
AFr      25    27    36    15    12    12  ( 12)
Aaus     21    27    38    20    12     9  (  9)
T        95    39    84    38    52    77    74

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

20 Mar 
Solar:        R0
Geomagnetic:  G0
In the BOM magnetometer data for 20 Mar, a weak (9nT) impulse 
was observed at 0226UT, a weak (10nT) impulse was observed at 
0401UT and a weak (9nT) impulse was observed at 1527UT.
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 30% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      No data available 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 15% over the UT day.

21 Mar 
Solar:        R0
Geomagnetic:  G1
Frequencies:  
   Cocos Island Region:
      Depressed by 25% during local day.
      Depressed by 30% during local night.
   Niue Island Region:
      No data available during local day.
      No data available during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

22 Mar 
Solar:        R0
Geomagnetic:  G2
Frequencies:  
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values 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 during local day.
      Enhanced 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 35% over the UT day.

23 Mar 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 40% during local night.
   Niue Island Region:
      No data available.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Depressed by 30-35%.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

24 Mar 
Solar:        R0
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      No data.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Depressed by 25% during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

25 Mar 
Solar:        R0
Geomagnetic:  G0
In the BOM magnetometer data for 25 Mar, a weak (8nT) impulse 
was observed at 0631UT.
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

26 Mar 
Solar:        R1, with an M3.9 at 0623UT
Geomagnetic:  G0
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% 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:
      Depressed by 25% during local day.
      Depressed by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

 
2. FORECAST (27 MARCH - 02 APRIL)
Solar: 
R0-R1 solar flare activity, possibly increasing in frequency by mid-week.

Geomagnetic:  
G0-G1 over 28-29 Mar. G0 on all other days.

Frequencies:  
Depressed by 15% after local dawn over 29-30 Mar.
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