[Ips-wgr] ASWFC Weekly Geo. Report (25 September 25) issued 0221 UT on 25 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (16 SEPTEMBER - 24 SEPTEMBER)
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 Sep   3333 3222   12  
 17 Sep   1222 2122    6  
 18 Sep   2122 2301    6  
 19 Sep   1100 0001    1  
 20 Sep   1111 0001    1  
 21 Sep   1220 1201    3  
 22 Sep   3222 3233   11  
 23 Sep   3212 4232   11  
 24 Sep   1112 3212    6  

*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 conditions with a mild increase of geomagnetic conditions observed
on 16-Sep and 22-23 Sep. Geomagnetic conditions were 
particularly quiet on the 19-20th. 

2. FORECAST (25 SEPTEMBER - 25 OCTOBER)
Disturbed Periods: 
03-07 Oct, 11-13 Oct

Best Quiet Periods: 
25 Sep-02 Oct, 08-10 Oct, 14-25 Oct.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Mildly Disturbed Periods: 13 Oct.
 Best Quiet Periods: 25 Sep - 12 Oct, 14-25 Oct.

Central Australian Regions:
 Disturbed Periods: 13 Oct.
 Mildly Disturbed Periods: 29 Sep, 03-06 Oct, 12 Oct, 14-16 Oct, 20-23 Oct.
 Best Quiet Periods: 25-28 Sep, 30 Sep-02 Oct, 07-11 Oct, 17-19 Oct, 24-25 Oct.

Southern Australian Regions:
 Disturbed Periods: 25 Sep, 29 Sep, 03-06 Oct, 12-16 Oct, 20-23 Oct.
 Best Quiet Periods: 26-28 Sep, 30 Sep-02 Oct, 07-11 Oct, 17-19 Oct, 24-25 Oct.


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