[Ips-wgr] ASWFC Weekly Geo. Report (04 September 25) issued 0243 UT on 04 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 04 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (26 AUGUST - 03 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               
 26 Aug   2222 1002    4  
 27 Aug   1111 2212    4  
 28 Aug   2122 0012    4  
 29 Aug   2211 1122    5  
 30 Aug   1122 1322    6  
 31 Aug   2211 1111    4  
 01 Sep   1210 0235   10  In the BOM magnetometer data for 01 
                          Sep, a weak (45nT) impulse was observed 
                          at 2059UT.
 02 Sep   5454 3454   33  
 03 Sep   2222 1021    5  

*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-G2 geomagnetic conditions were observed in the Australian region
on 01-03 Sep due to arrival of a M2.8 CME occurring on 30 Aug.  
G0 conditions were observed on 26-31 Aug.


2. FORECAST (04 SEPTEMBER - 04 OCTOBER)
Disturbed Periods: 
05-10 Sep, 15-17 Sep, 29 Sep-03 Oct.

Best Quiet Periods: 
04 Sep, 11-14 Sep,  18-28 Sep,

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions: 
Disturbed Periods: None.
Best Quiet Periods: 4 Sep to 4 Oct.
 
Central Australian Regions:
Mildly Disturbed Periods: 
05-10 Sep, 16 Sept, 18th Sep, 29 Sep.

Best Quiet Periods:
04 Sep, 10-15 Sep, 17 Sep, 19-28 Sep, 30 Sep - 03 Oct.

Southern Australian Regions:
Disturbed Periods: 
05-10 Sep, 16 Sept, 18th Sep, 29 Sep.

Best Quiet Periods:
04 Sep, 10-15 Sep, 17 Sep, 19-28 Sep, 30 Sep - 03 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