[Ips-wgr] ASWFC Weekly Geo. Report (09 April 26) issued 0328 UT on 09 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 09 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (31 MARCH - 08 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               
 31 Mar   1212 2111    4  
 01 Apr   2111 3212    6  In the BOM magnetometer data for 01 
                          Apr, a weak (9nT) impulse was observed 
                          at 1203UT.
 02 Apr   3344 4543   25  
 03 Apr   3344 4544   26  In the BOM magnetometer data for 03 
                          Apr, a weak (19nT) impulse was observed 
                          at 1528UT.
 04 Apr   2222 1132    7  
 05 Apr   3233 3311   11  
 06 Apr   1222 2222    6  
 07 Apr   2221 1312    6  
 08 Apr   1213 2122    6  

*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 on 02-03 Apr due to combined
effects from a glancing coronal mass ejection impact and a coronal 
hole high speed wind stream. G0 geomagnetic conditions were observed
on other days.

2. FORECAST (09 APRIL - 09 MAY)
Disturbed Periods: 
10-11 Apr,  16-20 Apr, 29-Apr to 01-May, 06-08 May.

Best Quiet Periods: 
12-14 Apr,  22-27 Apr, 03-05 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Mildly Disturbed Periods: None.
 Best Quiet Periods: 13-17 Apr, 22-28 Apr, 04-06 May.

Central Australian Regions:
 Disturbed Periods: None.
 Mildly Disturbed Periods: 10-12 Apr, 18-21 Apr, 29-Apr to 03-May, 07-09 May.
 Best Quiet Periods: 13-17 Apr, 22-28 Apr, 04-06 May.

Southern Australian Regions:
 Disturbed Periods: 10-12 Apr, 18-21 Apr, 29-Apr to 03-May, 07-09 May.
 Best Quiet Periods: 13-17 Apr, 22-28 Apr, 04-06 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