[Ips-wgr] ASWFC Weekly Geo. Report (24 April 25) issued 0056 UT on 24 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 24 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (15 APRIL - 23 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               
 15 Apr   2211 2345   14  In the BOM magnetometer data for 15 
                          Apr, a weak (10nT) impulse was observed 
                          at 1722UT.
 16 Apr   4344 5554   33  
 17 Apr   2421 3202    9  
 18 Apr   2222 1222    6  
 19 Apr   2233 3323   12  
 20 Apr   3221 1022    6  
 21 Apr   3344 4332   18  
 22 Apr   2221 1222    6  
 23 Apr   1212 2111    4  

*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 conditions observed from 15-16 Apr due to the arrival of a coronal 
mass ejection.  G0 conditions on other days. A mild increase
in geomagnetic activity was observed on 21-Apr due to a coronal 
hole wind stream.

2. FORECAST (24 APRIL - 24 MAY)
Disturbed Periods: 
01-02 May, 06 May, 18-May.

Best Quiet Periods: 
26-28 Apr, 8-11 May, 16-May, 23-24 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 24 Apr to 19 May.

Central Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 27-29 Apr,  07-11 May,  14-17 May

Southern Australian Regions:
 Disturbed Periods: 24-25 Apr, 01-05 May, 13-May, 18-19 May
 Best Quiet Periods: 27-29 Apr,  07-11 May,  14-17 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