[Ips-wgr] ASWFC Weekly Geo. Report (20 August 26) issued 0044 UT on 20 Aug 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 20 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (11 AUGUST - 19 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               
 11 Aug   0002 2311    4  In the BOM magnetometer data for 11 
                          Aug, a weak (9nT) impulse was observed 
                          at 1128UT.
 12 Aug   1212 2121    5  
 13 Aug   1110 0012    2  
 14 Aug   2223 2221    7  
 15 Aug   1100 1121    2  
 16 Aug   1111 0001    1  
 17 Aug   1111 1222    4  
 18 Aug   3322 2153   14  
 19 Aug   2434 2122   12  In the BOM magnetometer data for 19 
                          Aug, a weak (8nT) impulse was observed 
                          at 0421UT.

*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.

G1 geomagnetic conditions were observed in the Australian region on
UT day 18-Aug due to coronal hole high speed wind stream effects. 
Some local stations also recorded G1 conditions on 19-Aug, though
the Australian region overall remained at G0. 

2. FORECAST (20 AUGUST - 19 SEPTEMBER)
Disturbed Periods: 
 20 Aug, 14-16 Sep.

Best Quiet Periods: 
 22-23 Aug,  25-28 Aug,  1-3 Sep,  5-7 Sep,  9 Sep,  11-12 Sep, 18-19 Sep.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 20 Aug to 19 Sep.

Central Australian Regions:
 Mildly Disturbed Periods: 20-21 Aug, 15-17 Sep.
 Best Quiet Periods: 23 Aug to 13 Sep, 19 Sep.

Southern Australian Regions: 
 Disturbed Periods: 20-21 Aug, 15-17 Sep.
 Best Quiet Periods: 23 Aug to 13 Sep, 19 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