[Ips-wgr] ASWFC Weekly Geo. Report (21 May 26) issued 0341 UT on 21 May 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 21 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (12 MAY - 20 MAY)
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 May   0110 0011    1  
 13 May   1111 2222    5  
 14 May   2110 0001    2  
 15 May   2222 5335   19  
 16 May   4343 2322   15  
 17 May   2223 2222    8  
 18 May   2222 3212    7  
 19 May   1244 3432   16  
 20 May   2210 0001    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.

G1 geomagnetic storming was observed on 15-May in the Australian region.
G1 periods were observed at Canberra and Kennaook Cape Grim on 16-May, 
although G0 conditions were observed in the Australian region. G0 geomagnetic
conditions were observed on all other days of the week.

2. FORECAST (21 MAY - 20 JUNE)
Disturbed Periods: 
 30-May to 06-Jun, 11-14 Jun.

Best Quiet Periods: 
 22-29 May, 08-10 Jun, 16-20 Jun.

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

Central Australian Regions:
 Mildly Disturbed Periods: 04-05 Jun, 11-16 Jun
 Best Quiet Periods: 22-May to 02-Jun, 06-09 Jun, 18-20 Jun

Southern Australian Regions:
 Disturbed Periods: 04-05 Jun, 11-16 Jun
 Best Quiet Periods: 24-27 May, 29-May to 02-Jun, 06-09 Jun, 18-20 Jun

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