[Ips-wgr] ASWFC Weekly Geo. Report (19 June 25) issued 0118 UT on 19 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 19 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (10 JUNE - 18 JUNE)
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               
 10 Jun   1121 1222    5  
 11 Jun   2210 1343    9  
 12 Jun   2335 4244   21  
 13 Jun   4334 4344   22  
 14 Jun   3333 2233   13  
 15 Jun   1122 2232    7  
 16 Jun   2231 2111    6  
 17 Jun   1211 1222    5  
 18 Jun   2122 2212    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.


A G1 period was observed on 12-Jun during an interval of
mild geomagnetic activity observed during 12-13 Jun in 
association with an extended period of southward 
interplanetary magnetic field conditions that preceded 
the Earth's entry into a coronal hole wind stream. Planetary 
conditions reached G2 during this interval. G0 conditions 
were observed on other days of the week.

2. FORECAST (19 JUNE - 19 JULY)
Disturbed Periods: 
20 Jun,  24-26 Jun,  28-30 Jun.

Best Quiet Periods: 
 19-21 Jun,  3-7 Jul,  14-18 Jul.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: 26-Jun
 Best Quiet Periods: 19-24 Jun,  30 Jun to 15 Jul.

Central Australian Regions:
 Disturbed Periods:  26-Jun, 28 Jun
 Best Quiet Periods: 20-23 Jun, 3-9 Jul, 17-19 Jul

Southern Australian Regions:
 Disturbed Periods: 24-Jun to 02-Jul.
 Best Quiet Periods: 20-22 Jun,  4-8 Jul, 17-19 Jul


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