[Ips-wgr] ASWFC Weekly Geo. Report (18 September 25) issued 0151 UT on 18 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 18 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (09 SEPTEMBER - 17 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               
 09 Sep   2222 2224    9  
 10 Sep   2211 2312    6  
 11 Sep   2222 1211    5  
 12 Sep   1222 1221    5  
 13 Sep   1121 1101    3  
 14 Sep   2111 2233    7  
 15 Sep   5444 4333   25  
 16 Sep   3333 3222   12  
 17 Sep   1222 2122    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.


Active on 15 Sep.   Quiet to unsettled on other days.

2. FORECAST (18 SEPTEMBER - 18 OCTOBER)
Disturbed Periods: 
28-29 Sep, 6-Oct, 12-13 Oct.

Best Quiet Periods: 
 18-26 Sep, 1-4 Oct, 8-10 Oct, 16-18 Oct.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 28-29 Sep, 1-4 Oct, 8-10 Oct, 16-18 Oct.

Central Australian Regions:
 Disturbed Periods:  6-Oct, 12-13 Oct.
 Best Quiet Periods: 18-26 Sep, 1-4 Oct, 8-10 Oct, 16-18 Oct.

Southern Australian Regions:
 Disturbed Periods: 2-3 Oct, 8-9 Oct, 12-14 Oct.
 Best Quiet Periods: .18-30 Sep, 1-Oct, 16-18 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