[Ips-wgr] IPS Weekly Geo. Report (21 April 11)

[rwc]

SUBJ: IPS WEEKLY GEOPHYSICAL REPORT 
ISSUED ON 21 APRIL 2011, BY IPS RADIO AND SPACE SERVICES,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (12 APRIL - 20 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               
 12 Apr   2335 4322   17     
 13 Apr   2333 2111    8     
 14 Apr   2221 1011    4    
 15 Apr   2112 1111    4    
 16 Apr   2211 1101    3    
 17 Apr   1112 2211    4    
 18 Apr   1143 3312   11    A weak (13nT) impulse was observed in the IPS
                            magnetometer data at 0652UT on 18 Apr.
 19 Apr   2211 1112    4    
 20 Apr   3432 2111   10    

*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.

A coronal hole high speed wind stream caused Active conditions
on the 12th and Unsettled on the 13th. Conditions were then mostly
Quiet until a weak CME strike on the 18th and a new coronal hole 
stream caused Unsettled conditions on the 18th and 20th. 


2. FORECAST (21 APRIL - 21 MAY)
Disturbed Periods: 
30th April- 5th May, 9th May - 10 May

Best Quiet Periods: 
21 Apr to 27 Apr,   7 May,  12 May to 17 May.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS

Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 21 Apr to 25 Apr.

Central Australian Regions: 
 Midly Disturbed Periods: 30th April to 5th May, 9th May to 10th May

Southern Australian Regions:
 Disturbed Periods: 30th April to 5th May, 9th May to 10th May.
 Best Quiet Periods: 21 Apr to 25 Apr.

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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Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp.ips.gov.au 
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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