[Ips-wgr] IPS Weekly Geo. Report (23 April 09)

[rwc]

SUBJ: IPS WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 23 APRIL 2009, BY IPS RADIO AND SPACE SERVICES,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (14 APRIL - 22 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               
 14 Apr   1112 1001    2     
 15 Apr   2211 1211    4     
 16 Apr   1222 2312    7    
 17 Apr   2222 1212    6    
 18 Apr   2322 2222    8    
 19 Apr   2221 1111    4    
 20 Apr   2221 1111    4    
 21 Apr   1221 0011    3    
 22 Apr   2212 2001    4    

*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 Space Environment Research Center, Japan.


Quiet to unsettled conditions.

2. FORECAST (23 APRIL - 23 MAY)
Disturbed Periods: 
No strong recurrent patterns, however mild activity may be experienced on:
 6 May to 9 May,   15 May.

Best Quiet Periods: 
 23 Apr to 5 May,  10 May to 14 May,  16 May to 19 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS

All Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 23 Apr to 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.

IPS Radio and Space Services        email: asfc at ips.gov.au
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