[Ips-wgr] ASWFC Weekly Geo. Report (25 December 25) issued 0104 UT on 25 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 25 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (16 DECEMBER - 24 DECEMBER)
K indices are in UT (0-24). For conversion to local time:

AEST = UT + 10 hours; ACST = UT + 9.5 hours; AWST = UT + 8 hours
        Australian Region*              
 Date     K-INDICES    A               
 16 Dec   3222 2322    9  
 17 Dec   3222 3233   11  
 18 Dec   3233 2322   11  
 19 Dec   2211 1222    5  
 20 Dec   1121 2122    5  
 21 Dec   2334 4334   18  
 22 Dec   3233 4323   14  
 23 Dec   2333 4333   15  
 24 Dec   3333 3333   15  

*estimated from real time data

NOTE: Indices may have been generated from data obtained in 
cooperation with the following organisations: Geoscience Australia, 
University of Newcastle Space Physics Group, Australian Government 
Antarctic Division and International Center for Space Weather 
Science and Education, Japan.

G0 geomagnetic conditions were observed in the Australian region
this week. 

2. FORECAST (25 DECEMBER - 24 JANUARY)
Disturbed Periods: 
 25-27 Dec, 30-31 Dec,  6-8 Jan,  13-14 Jan, 17-23 Jan.

Best Quiet Periods: 
 4-5 Jan,  10-11 Jan,  15-16 Jan.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Mildly Disturbed Periods: 18 Jan.
 Best Quiet Periods: 25 Dec to 16 Jan, 20-25 Jan.

Central Australian Regions:
 Disturbed Periods: 18 Jan.
 Mildly Disturbed Periods: 25-27 Dec, 31 Dec to 02 Jan, 9-10 Jan, 12-15 Jan, 17
Jan, 19-23 Jan.
 Best Quiet Periods: 29 Dec, 4-7 Jan.

Southern Australian Regions:
 Disturbed Periods: 25-27 Dec, 31 Dec to 02 Jan, 9-10 Jan, 12-15 Jan, 17-23 Jan.
 Best Quiet Periods: 29 Dec, 4-7 Jan. 

Pc3 pulsations are high frequency (10-45 second period) variations 
of the Earths magnetic field. Daily pc3-indices are the daily sum of 
20 minute pc3-indices for that station and have been shown to be well 
correlated with rejection of high resolution aeromagnetic survey 
flight-line data.

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

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