[Ips-wgr] ASWFC Weekly Geo. Report (31 July 25) issued 0228 UT on 31 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 31 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (22 JULY - 30 JULY)
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               
 22 Jul   1202 2233    7  
 23 Jul   2334 4233   16  
 24 Jul   3233 3222   11  
 25 Jul   2211 1112    4  
 26 Jul   1112 3322    7  
 27 Jul   1112 0100    2  
 28 Jul   1111 1122    4  
 29 Jul   1232 0001    4  
 30 Jul   1102 2221    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 were observed throughout the week.

2. FORECAST (31 JULY - 30 AUGUST)
Disturbed Periods: 
18-19 Aug.

Best Quiet Periods: 
 31-Jul to 6 Aug,  9-17 Aug,  23-30 Aug.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 31 Jul to 30 Aug.

Central Australian Regions:
 Disturbed Periods: 18-22 Aug.
 Best Quiet Periods: 31 Jul to 17 Aug, 24-30 Aug.

Southern Australian Regions:
 Disturbed Periods: 18-23 Aug.
 Best Quiet Periods: 31 Jul to 6 Aug, 9-17 Aug,  25-30 Aug.


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