[Ips-wgr] ASWFC Weekly Geo. Report (17 July 25) issued 0057 UT on 17 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 17 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (08 JULY - 16 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               
 08 Jul   2322 1312    8  
 09 Jul   2212 2212    6  
 10 Jul   1100 0000    1  
 11 Jul   2223 3232   10  
 12 Jul   2233 3212    9  
 13 Jul   3433 3222   13  
 14 Jul   2231 3232    9  
 15 Jul   3334 2211   11  
 16 Jul   2324 1123   10  

*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 Australian regional geomagnetic field was at the G0 level all week,
with a mild increase in geomagnetic activity from 11-Jul due to a 
coronal hole wind stream. Isolated periods of planetary G1 conditions 
were observed during te interval 13-16 Jul.

2. FORECAST (17 JULY - 16 AUGUST)
Disturbed Periods: 
17-18 Jul,  22-24 Jul,  31-Jul to 2-Aug,  7 Aug.

Best Quiet Periods: 
 26-29 Jul, 5-6 Aug, 15-16 Aug.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 17 Jul to 16 Aug.

Central Australian Regions:
 Disturbed Periods: 23-26 Jul, 9-12 Aug
 Best Quiet Periods: 20-Jul, 30-Jul to 01-Aug, 6-7 Aug, 15-16 Aug.

Southern Australian Regions:
 Disturbed Periods: 23-26 Jul,  9-12 Aug.
 Best Quiet Periods: 30-Jul to 01-Aug, 15-16 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