[Ips-wgr] ASWFC Weekly Geo. Report (21 September 23) issued 0116 UT on 21 Sep 2023 [SEC=OFFICIAL]

[rwc]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 21 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (12 SEPTEMBER - 20 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               
 12 Sep   1213 4543   18  In the BOM magnetometer data for 12 
                          Sep, a weak (12nT) impulse was observed 
                          at 1120UT and a weak (18nT) impulse 
                          was observed at 1217UT.
 13 Sep   3222 3312    9  
 14 Sep   2232 1133    9  
 15 Sep   2210 1312    5  
 16 Sep   1111 0222    4  
 17 Sep   3322 2233   11  In the BOM magnetometer data for 17 
                          Sep, a weak (15nT) impulse was observed 
                          at 0232UT.
 18 Sep   3222 4444   18  In the BOM magnetometer data for 18 
                          Sep, a weak (17nT) impulse was observed 
                          at 1329UT.
 19 Sep   4443 4532   24  
 20 Sep   2233 2123    9  

*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-Minor geomagnetic storm observed on 19-Sep from a CME arrival 
associated with a solar filament eruption observed on 16-Sep.
Planetary geomagnetic conditions briefly reached G3 on 19-Sep. The 
isolated G1 period of geomagnetic activity on 12-Sep was associated 
with a slow glancing blow CME from an unknown solar origin. Planetary
Kp reached G2-Moderate on this day. G0 conditions were observed on 
other days of the week.

2. FORECAST (21 SEPTEMBER - 21 OCTOBER)
Disturbed Periods: 
9 Oct,  15 Oct.

Best Quiet Periods: 
 24-27 Sep, 4-8 Oct,  19-24 Oct.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: All days.

Central Australian Regions: NA

Southern Australian Regions:
 Disturbed Periods: 29-Sep, 16-17 Oct.
 Best Quiet Periods: 24-27 Sep, 02-13 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