[Ips-wgr] ASWFC Weekly Geo. Report (20 April 23) issued 0139 UT on 20 Apr 2023 [SEC=OFFICIAL]

[rwc]

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 20 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx

1. SUMMARY (11 APRIL - 19 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               
 11 Apr   1231 1111    5  
 12 Apr   1110 1101    2  
 13 Apr   2200 1212    4  
 14 Apr   1111 2111    3  
 15 Apr   1222 3111    6  
 16 Apr   1121 0001    2  
 17 Apr   1221 1201    4  
 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  

*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.


Quiet to unsettled conditions.

2. FORECAST (20 APRIL - 20 MAY)
Disturbed Periods: 
20-21 Apr, 26-Apr. 

Best Quiet Periods: 
 24-25 Apr,  4-6 May,  8-14 May, 19-20 May

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions: 
 Disturbed Periods: None
 Best Quiet Periods: 20- Apr to 20-May

Central Australian Regions: 
 Disturbed Periods: None
 Mildly Disturbed Periods: 26-Apr
 Best Quiet Periods: 24-25 Apr, 4-8 May, 19-20 May

Southern Australian Regions:
 Disturbed Periods: 26 Apr.
 Best Quiet Periods: 24-25 Apr, 4-8 May, 19-20 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