[Ips-wgr] ASWFC Weekly Geo. Report (30 April 26) issued 0159 UT on 30 Apr 2026 [SEC=OFFICIAL]

Thu Apr 30 11:59:20 AEST 2026

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 30 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (21 APRIL - 29 APRIL)
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               
 21 Apr   3312 3431   12  
 22 Apr   1101 1011    2  
 23 Apr   1211 1101    3  
 24 Apr   2121 1222    5  
 25 Apr   2211 0132    5  
 26 Apr   2323 0022    7  
 27 Apr   2211 2101    4  
 28 Apr   0010 0010    0  
 29 Apr   0000 2101    1  

*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 (30 APRIL - 30 MAY)
Disturbed Periods: 
 7-9 May,  15-18 May.

Best Quiet Periods: 
 1-2 May,  5-6 May,  10-14 May,  19-20 May,  24-26 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 30 Apr to 30 May.

Central Australian Regions:
 Mildly Disturbed Periods: 8-9 May, 18 May.
 Best Quiet Periods: 30 Apr to 6 May, 11-16 May, 20-30 May.

Southern Australian Regions:
 Disturbed Periods: 8-9 May, 18 May.
 Best Quiet Periods: 30 Apr to 6 May, 11-16 May, 20-30 May.

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