[Ips-wgr] SWS Weekly Geo. Report (21 December 17) issued 0230 UT on 21 Dec 2017 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 21 DECEMBER 2017, BY Space Weather Services,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

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   2222 1232    7  
 13 Dec   1122 2121    5  
 14 Dec   2111 1012    3  
 15 Dec   1112 2212    5  
 16 Dec   1111 1102    3  
 17 Dec   2233 3333   13  
 18 Dec   3333 3211   11  
 19 Dec   2111 2212    5  
 20 Dec   1212 1110    3  

*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 (21 DECEMBER - 20 JANUARY)
Disturbed Periods: 
1-4 Jan, 13- 14 Jan.

Best Quiet Periods: 
24-26 Dec,  28-30 Dec,  5-6 Jan,  9-12 Jan.

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

Central Australian Regions: 
Mildly disturbed:1-3 Jan, 13-14 Jan.

Southern Australian Regions: 
Disturbed:1-3 Jan, 13-14 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.

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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