[Ips-wgr] ASWFC Weekly Geo. Report (20 February 25) issued 0046 UT on 20 Feb 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 20 FEBRUARY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (11 FEBRUARY - 19 FEBRUARY)
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               
 11 Feb   3332 3322   12  
 12 Feb   2223 2332   10  
 13 Feb   2223 3334   13  
 14 Feb   3322 4333   14  
 15 Feb   3335 3433   20  
 16 Feb   2233 2332   11  
 17 Feb   2222 3323   10  
 18 Feb   3321 1323   10  
 19 Feb   3232 1233   10  

*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.


A mild increase in geomagnetic activity was observed this week
due to a coronal hole wind stream. An isolated G1 period
was observed on 15-Feb, with G0 conditions observed on other
days.

2. FORECAST (20 FEBRUARY - 22 MARCH)
Disturbed Periods: 
28-Feb to 01-Mar. 08-09 Mar, 12-14 Mar, 18-Mar.

Best Quiet Periods: 
 21-23 Feb,  25-27 Feb, 03-06 Mar, 20-22 Mar, 25-26 Mar.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions: NA

Central Australian Regions: NA

Southern Australian Regions:
 Disturbed Periods: 28-Feb to 01-Mar, 09-11 Mar,  13-15 Mar.
 Best Quiet Periods: 22-27 Feb,  03-07 Mar, 21-25 Mar.


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