[Ips-wgr] ASWFC Weekly Geo. Report (11 December 25) issued 0113 UT on 11 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 11 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (02 DECEMBER - 10 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               
 02 Dec   2221 1222    6  
 03 Dec   1123 5445   22  
 04 Dec   3334 4333   18  
 05 Dec   3332 2232   11  
 06 Dec   3332 2222   10  
 07 Dec   2222 2111    5  
 08 Dec   1210 0011    2  
 09 Dec   1011 1112    3  
 10 Dec   2231 2345   16  

*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.

G1 on 3-Dec due to coronal hole high speed wind stream effects and 
10-Dec due to coronal mass ejection arrival. G0 on other days.

2. FORECAST (11 DECEMBER - 10 JANUARY)
Disturbed Periods: 
11-14 Dec,  22-24 Dec,  30 Dec to 1 Jan.

Best Quiet Periods: 
 16-18 Dec,  4-5 Jan.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Mildly Disturbed Periods: 22-23 Dec.
 Best Quiet Periods: 15-19 Dec,  29-Dec, 4-6 Jan.

Central Australian Regions:
 Disturbed Periods: 22-23 Dec.
 Mildly Disturbed Periods: 11-14 Dec, 21 Dec 24-26 Dec, 31-Dec, 01-02 Jan
 Best Quiet Periods: 16-19 Dec,  29-Dec, 4-6 Jan.

Southern Australian Regions:
 Disturbed Periods: 11-14 Dec, 21-26 Dec, 31-Dec, 01-02 Jan
 Best Quiet Periods: 16-19 Dec,  29-Dec, 4-6 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