[Ips-wgr] ASWFC Weekly Geo. Report (09 October 25) issued 0118 UT on 09 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 09 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (30 SEPTEMBER - 08 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               
 30 Sep   3445 5445   33  
 01 Oct   3343 5343   22  
 02 Oct   4435 3233   21  
 03 Oct   3344 3332   17  
 04 Oct   2334 4321   14  
 05 Oct   2222 2102    5  
 06 Oct   1111 2111    3  
 07 Oct   2223 3322   10  
 08 Oct   2222 4211    8  

*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.

The Earth entered a coronal hole high speed wind stream on 30-Sep and
a prolonged period of moderately elevated regional geomagnetic activity was
observed 30-Sep to 03-Oct with the Australian regional field reaching
G1 on 30-Sep, 01-Oct and 02 Oct. Planetary geomagnetic conditions 
were G3 on 30-Sep and on 02-Oct, G2 on 01-Oct, and G1 on 03-Oct. 


2. FORECAST (09 OCTOBER - 08 NOVEMBER)
Disturbed Periods: 
12-13 Oct,  26-27-Oct, 30-Oct.

Best Quiet Periods: 
15-20 Oct,  23-24 Oct, 6 Nov.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Mildly Disturbed Periods: 28-30 Oct
 Best Quiet Periods: 16-19 Oct, 22-27 Oct, 02-07 Nov

Central Australian Regions:
 Mildly Disturbed Periods: 12-Oct, 14-15 Oct, 20-21 Oct 
 Disturbed: 13-Oct, 28-30 oct
 Best Quiet Periods: 16-19 Oct, 23-26 Oct, 03-06 Nov.

Southern Australian Regions:
 Disturbed Periods: 12-15 Oct,  20-21 Oct,  28-31 Oct.
 Best Quiet Periods: 16-19 Oct, 23-26 Oct, 03-06 Nov.


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