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

[rwc]

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

1. SUMMARY (14 JULY - 22 JULY)
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 Jul   3232 2111    7     
 15 Jul   1211 2101    3     
 16 Jul   1110 0001    1    
 17 Jul   1110 0001    1    
 18 Jul   1111 0000    1    
 19 Jul   1111 0001    1    
 20 Jul   1112 2211    4    
 21 Jul   1211 1111    3    
 22 Jul   2344 1121   11    

*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.


Geomagnetic activity remained mostly at quiet to unsettled 
levels during this period, but on 22 July a sudden rise was 
observed with activity rising upto major storm levels on high 
latitudes. This was due to a delayed effect of a high speed solar
wind stream from a recurrent coronal hole. 

2. FORECAST (23 JULY - 22 AUGUST)
Disturbed Periods: 
No strong recurrent patterns, however mild activity may be experienced on:
  25 to 26 Jul,  9 Aug to 10 Aug.

Best Quiet Periods: 
 24 Jul,  27 Jul to 8 Aug,  11 Aug to 17 Aug.

3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS

Northern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 23 Jul to 16 Aug.

Central Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 23 Jul to 16 Aug.

Southern Australian Regions:
 Disturbed Periods: None.
 Best Quiet Periods: 23 Jul to 16 Aug.

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 
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