[Ips-wgr] SWS Weekly Geo. Report (22 April 21) issued 0153 UT on 22 Apr 2021

[rwc]

SUBJ: SWS WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 22 APRIL 2021, BY Space Weather Services,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (13 APRIL - 21 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               
 13 Apr   1112 1112    4  
 14 Apr   1212 2122    5  
 15 Apr   2341 2211    9  In the SWS magnetometer data for 15 
                          Apr, a weak (8nT) impulse was observed 
                          at 0649UT.
 16 Apr   2323 3243   13  
 17 Apr   3344 4323   18  
 18 Apr   3334 3233   15  
 19 Apr   2334 3222   12  
 20 Apr   2224 2232   10  
 21 Apr   1223 2001    5  

*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 17 Apr.   Quiet to unsettled on other days.

2. FORECAST (22 APRIL - 22 MAY)
Disturbed Periods: 
 23-24 April, 13-16 May.

Best Quiet Periods: 
 26 Apr to 3 May,  5-11 May, 19 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 26 Apr to 12 May, 19 May.

Central Australian Regions:
 Mildly Disturbed Periods: 14-18 May.
 Best Quiet Periods: 26 Apr to 12 May, 19 May.

Southern Australian Regions:
 Disturbed Periods: 14-18 May.
 Best Quiet Periods: 26 Apr to 12 May, 19 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.

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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