[Ips-wgr] ASWFC Weekly Geo. Report (17 September 26) issued 0131 UT on 17 Sep 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 17 SEPTEMBER 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (08 SEPTEMBER - 16 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               
 08 Sep   3235 5332   21  
 09 Sep   1212 2322    7  
 10 Sep   1113 3102    6  
 11 Sep   1222 2212    6  
 12 Sep   2222 2111    5  
 13 Sep   2220 2101    4  
 14 Sep   2222 2323    9  
 15 Sep   3310 2023    7  
 16 Sep   3222 3001    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.


G1 on 8 Sep in the Australian region. G0 on all other days.

2. FORECAST (17 SEPTEMBER - 17 OCTOBER)
Disturbed Periods: 
17-Sep, 24-25 Sep, 4-5 Oct, 11-12 Oct

Best Quiet Periods: 
 18-23 Sep, 26-Sep to 2-Oct, 8-10 Oct

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 18-23 Sep, 24-Sep to 2-Oct, 8-10 Oct

Central Australian Regions:
 Disturbed Periods: None.
 Mildly Disturbed Periods: 17-Sep, 24-25 Sep, 4-5 Oct, 11-12 Oct.
 Best Quiet Periods: 18-23 Sep, 26-Sep to 2-Oct, 8-10 Oct. 

Southern Australian Regions: 
 Disturbed Periods: 17-Sep, 24-25 Sep, 4-5 Oct, 11-12 Oct.
 Quiet Periods: 18-23 Sep, 26-Sep to 2-Oct, 8-10 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