[Ips-wgr] ASWFC Weekly Geo. Report (23 October 25) issued 0149 UT on 23 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 23 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (14 OCTOBER - 22 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               
 14 Oct   2121 1212    5  
 15 Oct   2332 2002    7  
 16 Oct   1111 1112    3  
 17 Oct   2123 3322    9  
 18 Oct   4543 3453   27  In the BOM magnetometer data for 18 
                          Oct, a weak (19nT) impulse was observed 
                          at 0229UT.
 19 Oct   3332 2323   12  
 20 Oct   2321 2112    6  
 21 Oct   2210 0122    4  
 22 Oct   1111 1122    4  

*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.

G0 geomagnetic conditions observed for most of the week.
G1 conditions were observed on 18-Oct due to coronal hole high
speed wind stream effects.

2. FORECAST (23 OCTOBER - 22 NOVEMBER)
Disturbed Periods: 
 26-31 Oct, 7-9 Nov, 13-15 Nov.
Best Quiet Periods: 
 23-24 Oct, 2-Nov, 5-6 Nov, 11-12 Nov and 16-22 Nov.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: 28-30 Oct and 8-Nov.
 Best Quiet Periods: 23-27 Oct, 31-Oct to 7-Nov and 10-22 Nov.

Central Australian Regions:
 Disturbed Periods: 28-31 Oct, 8-11 Nov and 15-16 Nov.
 Best Quiet Periods: 23-27 Oct, 1-7 Nov, 12-14 Nov and 18-22 Nov.

Southern Australian Regions:
 Disturbed Periods: 27-Oct to 1-Nov, 8-11 Nov and 14-17 Nov.
 Best Quiet Periods: 24-26 Oct,  2-7 Nov,  12-13 Nov and 18-22 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