[Ips-wgr] IPS Weekly Geo. Report (26 April 12) issued 0256 UT on 26 Apr 2012

[rwc]

SUBJ: IPS WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 26 APRIL 2012, BY IPS RADIO AND SPACE SERVICES,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (17 APRIL - 25 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               
 17 Apr   1122 2232    7  
 18 Apr   2321 2211    6  
 19 Apr   1100 1022    2  
 20 Apr   1332 1111    6  
 21 Apr   2111 0122    4  
 22 Apr   2322 2211    7  
 23 Apr   2432 3343   16  In the IPS magnetometer data for 23 
                          Apr, a weak (15nT) impulse was observed 
                          at 0322UT.
 24 Apr   3341 3333   15  
 25 Apr   3243 3343   17  

*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.


Active on 23 Apr,  25 Apr.   Quiet to unsettled on other days.

2. FORECAST (26 APRIL - 26 MAY)
Disturbed Periods: 
26-27 Apr,  10 May.

Best Quiet Periods: 
 3-9 May,  13-15 May, 17-26 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS
Northern Australian Regions: NA

Central Australian Regions:
 Disturbed Periods: 26-27 Apr.
 Best Quiet Periods: 29 Apr to 22 May.

Southern Australian Regions:
 Disturbed Periods: 26-27 Apr.
 Best Quiet Periods: 3-9 May,  13-15 May, 17-22 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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