[Ips-geo-warning] ASWFC GEOMAGNETIC WARNING issued 2215 UT on 27 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC GEOMAGNETIC DISTURBANCE WARNING 25/102
ISSUED AT 2212UT/27 DECEMBER 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

For 30-Dec planetary geomagnetic 27-day recurrence patterns show 
G3 conditions for the last two rotations due to southward IMF 
conditions preceding a coronal hole wind stream entry. However, 
the coronal hole on this rotation is smaller and less distinct 
possibly indicating that the southward IMF structure in the solar 
wind may also be weaker. Planetary G1, chance G2 conditions are 
forecast for 30-Dec and G0-G1 conditions are expected on 31-Dec. 
Geomagnetic activity in the Australian region is expected to 
be G0, chance G1 on 30-31 Dec.

INCREASED GEOMAGNETIC ACTIVITY EXPECTED 
DUE TO CORONAL HOLE HIGH SPEED WIND STREAM
FROM 30-31 DECEMBER 2025
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GEOMAGNETIC ACTIVITY FORECAST
30 Dec:  G1, chance G2
31 Dec:  G0-G1

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au