[Ips-wgr] ASWFC Weekly Geo. Report (21 August 25) issued 0118 UT on 21 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 21 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (12 AUGUST - 20 AUGUST)
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               
 12 Aug   3322 2222    9  
 13 Aug   2223 3233   11  
 14 Aug   2222 2211    6  
 15 Aug   2211 0121    4  
 16 Aug   1211 0201    3  
 17 Aug   1111 1100    2  
 18 Aug   0112 2212    4  
 19 Aug   2223 3343   13  
 20 Aug   3223 1112    7  

*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 were observed in the Australian region
this week. 

2. FORECAST (21 AUGUST - 20 SEPTEMBER)
Disturbed Periods: 
 4-7 Sep,  15-16 Sep.

Best Quiet Periods: 
 24-25 Aug,  30 Aug to 2 Sep,  11-14 Sep.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 21 Aug to 20 Sep.

Central Australian Regions: 
 Mildly Disturbed Periods: 21-22 Aug, 6-9 Sep, 16-18 Sep.  
 Best Quiet Periods: 24 Aug to 4 Sep, 11-14 Sep, 20 Sep. 

Southern Australian Regions:
 Disturbed Periods: 21-22 Aug, 6-9 Sep, 16-18 Sep.  
 Best Quiet Periods: 24 Aug to 4 Sep, 11-14 Sep, 20 Sep.

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