[Ips-wgr] ASWFC Weekly Geo. Report (20 November 25) issued 0328 UT on 20 Nov 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 20 NOVEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (11 NOVEMBER - 19 NOVEMBER)
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               
 11 Nov   1221 0103    4  In the BOM magnetometer data for 11 
                          Nov, a weak (8nT) impulse was observed 
                          at 2253UT.
 12 Nov   7757 5454   77  
 13 Nov   5553 5431   31  
 14 Nov   1111 1201    3  
 15 Nov   2112 1123    6  
 16 Nov   2323 3333   13  In the BOM magnetometer data for 16 
                          Nov, a weak (9nT) impulse was observed 
                          at 0213UT and a weak (14nT) impulse 
                          was observed at 0511UT.
 17 Nov   2221 2122    6  
 18 Nov   2210 0001    2  
 19 Nov   1010 1121    2  

*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.

G3 conditions were observed in the Australian region on 12-Nov and
G1 on 13-Nov, G0 otherwise.

2. FORECAST (20 NOVEMBER - 20 DECEMBER)
Disturbed Periods: 
26-27 Nov, 2-5 Dec.

Best Quiet Periods: 
 20 Nov, 23-24 Nov, 29 Nov to 1 Dec,  9-20 Dec.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: 27-Nov.
 Best Quiet Periods: 20-26 Nov, 29 Nov to 20 Dec.

Central Australian Regions:
 Disturbed Periods: 26-29 Nov, 3-7 Dec.
 Best Quiet Periods: 20-Nov, 23-24 Nov,  30 Nov to 1 Dec,  9-20 Dec.

Southern Australian Regions:
 Disturbed Periods: 26-29 Nov, 3-7 Dec.
 Best Quiet Periods: 20-Nov, 23-24 Nov,  30 Nov to 1 Dec,  9-20 Dec.


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