[Ips-wgr] ASWFC Weekly Geo. Report (27 April 23) issued 0159 UT on 27 Apr 2023 [SEC=OFFICIAL]

[rwc]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 27 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (18 APRIL - 26 APRIL)
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               
 18 Apr   1210 3332    8  In the BOM magnetometer data for 18 
                          Apr, a weak (15nT) impulse was observed 
                          at 1400UT.
 19 Apr   2223 3311    9  
 20 Apr   1221 1202    4  
 21 Apr   2213 0222    6  
 22 Apr   2210 0112    3  
 23 Apr   2225 4465   31  In the BOM magnetometer data for 23 
                          Apr, a weak (30nT) impulse was observed 
                          at 1736UT.
 24 Apr   5555 3223   29  
 25 Apr   2111 3232    7  
 26 Apr   2223 4332   12  

*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 24 Apr. Minor storm on 23 Apr.  Quiet to unsettled on other days.

2. FORECAST (27 APRIL - 27 MAY)
Disturbed Periods: 
27 Apr,  23 May.

Best Quiet Periods: 
 5-May,  9-13 May,  22-23 May

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 30-Apr to 23-May.

Central Australian Regions:
 Disturbed Periods: None.
 Mildly Disturbed Periods: 27-29 Apr, 20-May
 Best Quiet Periods: 27-Apr to 23-May.

Southern Australian Regions:
 Disturbed Periods: 27-28 Apr, 20-21 May.
 Best Quiet Periods: 5-May, 9-13 May, 22-23 May.


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