[Ips-wgr] ASWFC Weekly Geo. Report (02 October 25) issued 0201 UT on 02 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 02 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (23 SEPTEMBER - 01 OCTOBER)
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               
 23 Sep   3212 4232   11  
 24 Sep   1112 3212    6  
 25 Sep   1122 3112    6  
 26 Sep   1112 1012    3  
 27 Sep   1201 1022    3  
 28 Sep   3212 2322    8  
 29 Sep   2225 4442   19  
 30 Sep   3445 5445   33  
 01 Oct   3343 5343   22  

*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 29, 30-Sep and on 01-Oct. G0 on all other days. 

2. FORECAST (02 OCTOBER - 01 NOVEMBER)
Disturbed Periods: 
3-5 Oct, 8-Oct, 11-13 Oct,  26-29 Oct

Best Quiet Periods: 
 15-24 Oct

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Mildly disturbed Periods: 13, 28 and 29 Oct
 Best Quiet Periods: 8-10 Oct, 15-24 Oct

Central Australian Regions:
 Disturbed Periods: 13, 28 and 29 Oct
 Mildly disturbed: 3-5 Oct, 12-Oct, 14-15 Oct, 20-21 Oct
 Best Quiet Periods: 15-24 Oct

Southern Australian Regions:
 Disturbed Periods: 3-5 Oct, 12-15 Oct, 20-21 Oct, 28-29 Oct
 Best Quiet Periods: 15-24 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