[Ips-wgr] ASWFC Weekly Geo. Report (29 September 22) issued 0159 UT on 29 Sep 2022 [SEC=OFFICIAL]

[rwc]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 29 SEPTEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
+++ CORRECTION +++
1. SUMMARY (20 SEPTEMBER - 28 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               
 20 Sep   1211 1121    4  
 21 Sep   1112 1002    3  
 22 Sep   1120 1113    4  
 23 Sep   2122 3323    9  
 24 Sep   2212 2222    6  
 25 Sep   1112 2101    3  
 26 Sep   1101 1003    3  
 27 Sep   4534 2222   18  
 28 Sep   1100 0111    1  

*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.

Unexpected brief geomagnetic activity was observed on 27-Sep. The
Australian regional geomagnetic field reached G1 for the K period 27/03-06UT.
The planetary geomagnetic field Kp index reach G2 for the period 27/00-03UT.
Speculatively,this disturbance may have been associated with an erupting 
solar prominence that was observed on 23-Sep (13-14UT) in the south west solar 
quadrant, with subsequent event modelling indicating an Earth miss. The
prominence 
may have extended further back across the face of the solar disk than what was
realised, 
resulting in a partial Earth directed component. The regional geomagnetic field 
was at the ASWAS G0 level on other days of the week.


2. FORECAST (29 SEPTEMBER - 29 OCTOBER)
Disturbed Periods: 
30 Sep to 02 Oct.

Best Quiet Periods: 
 08-14 Oct,  16-19 Oct,  22-23 Oct,  25 Oct.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 08-25 Oct.

Central Australian Regions: 
 Mildly Disturbed: 30-Sep to 05-Oct.
 Best Quiet Periods: 09-23 Oct.

Southern Australian Regions:
 Disturbed Periods: 30-Sep to 05-Oct.
 Best Quiet Periods: 09-23 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