[Ips-wgr] ASWFC Weekly Geo. Report (28 September 23) issued 0157 UT on 28 Sep 2023 [SEC=OFFICIAL]

[rwc]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 28 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (19 SEPTEMBER - 27 SEPTEMBER)
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               
 19 Sep   4443 4532   24  
 20 Sep   2233 2123    9  
 21 Sep   2231 3312    9  
 22 Sep   1123 3211    7  
 23 Sep   1222 2122    6  
 24 Sep   1122 0055   14  In the BOM magnetometer data for 24 
                          Sep, a weak (26nT) impulse was observed 
                          at 2041UT.
 25 Sep   4443 4222   18  
 26 Sep   2334 5332   18  
 27 Sep   3334 3321   14  

*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.


Active on 19 Sep,  25-26 Sep.   Quiet to unsettled on other days.

2. FORECAST (28 SEPTEMBER - 28 OCTOBER)
Disturbed Periods: 
9 Oct,  15 Oct.

Best Quiet Periods: 
 4-7 Oct,  13-Oct, 28-Oct.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 03-08 Oct, 12-13 Oct, 19-20 Oct, 28-Oct.

Central Australian Regions:
 Disturbed Periods: None.
 Mildly Disturbed Periods: 29-Sep, 09-Oct, 15-16 Oct.
 Best Quiet Periods: 03-07 Oct, 12-13 Oct, 28-Oct.

Southern Australian Regions:
 Disturbed Periods: 29-Sep, 09-Oct, 15-16 Oct, 22-23 Oct.
 Best Quiet Periods: 04-07 Oct, 13-Oct, 28-Oct. 


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