[Ips-wgr] ASWFC Weekly Geo. Report (21 December 23) issued 0103 UT on 21 Dec 2023 [SEC=OFFICIAL]

[rwc]

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

1. SUMMARY (12 DECEMBER - 20 DECEMBER)
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 Dec   1111 2222    5  
 13 Dec   1212 1323    7  
 14 Dec   2223 2112    7  
 15 Dec   1114 4333   13  In the BOM magnetometer data for 15 
                          Dec, a weak (18nT) impulse was observed 
                          at 1146UT.
 16 Dec   3332 3022   10  
 17 Dec   2253 5524   25  In the BOM magnetometer data for 17 
                          Dec, a weak (28nT) impulse was observed 
                          at 0737UT.
 18 Dec   3455 3234   25  In the BOM magnetometer data for 18 
                          Dec, a weak (11nT) impulse was observed 
                          at 0216UT, a weak (19nT) impulse was 
                          observed at 0402UT, a weak (23nT) impulse 
                          was observed at 0540UT and a weak (9nT) 
                          impulse was observed at 1540UT.
 19 Dec   3332 1122    9  
 20 Dec   3222 2212    7  

*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 geomagnetic conditions were observed in the Australian region over
17-18 Dec due to CME arrivals. G0 geomagnetic conditions were observed
on other days.

2. FORECAST (21 DECEMBER - 20 JANUARY)
Disturbed Periods: 
No strong recurrent patterns, however mild activity may be experienced on:
 29-Dec to 2-Jan, 8-12 Jan.

Best Quiet Periods: 
 21-27 Dec,  3-7 Jan, 13 Jan.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions: 
 Disturbed periods: None.

Central Australian Regions: 
 Mildly Disturbed Periods: 22-23 Dec, 28 Dec, 31-Dec to 3-Jan, 15 Jan.
 Best Quiet Periods: 21 Dec, 25-26 Dec, 5-13 Jan.

Southern Australian Regions:
 Disturbed Periods: 22-23 Dec, 28 Dec, 31-Dec to 3-Jan, 15 Jan.
 Best Quiet Periods: 21 Dec, 25-26 Dec, 5-13 Jan.

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