[Ips-wgr] ASWFC Weekly Geo. Report (17 April 25) issued 0047 UT on 17 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 17 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (08 APRIL - 16 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               
 08 Apr   2332 4333   14  
 09 Apr   3334 3333   16  
 10 Apr   3232 1223    9  
 11 Apr   2222 2233    9  
 12 Apr   3222 3323   11  
 13 Apr   3223 3222   10  
 14 Apr   2321 3322    9  
 15 Apr   2211 2345   14  In the BOM magnetometer data for 15 
                          Apr, a weak (10nT) impulse was observed 
                          at 1722UT.
 16 Apr   5335 728   41  

*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.


G4 on 16-Apr. G2 on 16-Apr. G0 on all other days. 

2. FORECAST (17 APRIL - 17 MAY)
Disturbed Periods: 
20-Apr, 22-24 Apr,  30-Apr to 3-May,  5-8 May. 

Best Quiet Periods: 
 25-29 Apr, 6-11 May, 14-16 May

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 25-29 Apr, 6-11 May, 14-17 May

Central Australian Regions:
 Disturbed Periods: None.
 Mildly Disturbed Periods: 20-Apr, 22-24 Apr, 29-Apr to 3-May, 5-8 May
 Best Quiet Periods: 25-28 Apr, 11-15 May.

Southern Australian Regions:
 Disturbed Periods: 20-Apr, 22-24 Apr, 29-Apr to 3-May, 5-8 May.
 Best Quiet Periods: 25-28 Apr, 11-15 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