[Ips-wsgr] IPS Weekly Solar and Geophysical Report (22 April 11)

[rwc]

SUBJ: IPS WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 22 APRIL 2011, BY IPS RADIO AND SPACE SERVICES,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (15 APRIL - 21 APRIL)
Date     15    16    17    18    19    20    21
10cm    129   119   114   111   111   117   113
AFr       3     2     2     8     4    11 (  5)
Aaus      4     3     4    11     4    10 (  3)
T        61    58    62    51    49    58    57

Solar:        Solar flare activity
Geomagnetic:  Geomagnetic activity observed for Australian region.
Frequencies:  Australian ionospheric F2 critical frequencies

15 Apr 
Solar:        moderate, with an   M1.3 at 1713UT 
Geomagnetic:  Quiet 

Frequencies:  
   Cocos Island Region:
      Enhanced by 15% during local day,
      Near predicted monthly values during local night.
   Niue Island Region:
      Mostly near predicted monthly values,
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values,
      Enhanced by 30% after local dawn.
   Southern Australian and New Zealand Region:
      Mostly near predicted monthly values,
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

16 Apr 
Solar:        low
Geomagnetic:  Quiet 

Frequencies:  
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Variable conditions during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Enhanced by 15% during local day,
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 20% over the UT day.

17 Apr 
Solar:        low
Geomagnetic:  Quiet 

Frequencies:  
   Cocos Island Region:
      Enhanced by 30%.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Mostly near predicted monthly values,
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 20% during local day, 
      Near predicted monthly values at other times.

18 Apr 
Solar:        low
Geomagnetic:  Quiet to Active 
A weak (13nT) impulse was observed in the IPS magnetometer data at
0652UT on 18 Apr.
Frequencies:  
   Cocos Island Region:
      Near predicted monthly values during local day,
      Enhanced by 15% during local night.
   Niue Island Region:
      Enhanced by 15% during local day,
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

19 Apr 
Solar:        low
Geomagnetic:  Quiet 

Frequencies:  
   Cocos Island Region:
      Near predicted monthly to Enhanced by 30%.
   Niue Island Region:
      Depressed by 15% from 01-10UT,
      Near predicted monthly values at other times.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values to Enhanced over the UT day.

20 Apr 
Solar:        low
Geomagnetic:  Quiet to Active 

Frequencies:  
   Cocos Island Region:
      Enhanced by 20% during local day,
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Enhanced by 15% between 04UT-10UT,
      Near predicted monthly values at other times.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

21 Apr 
Solar:        low
Geomagnetic:  Quiet 

Frequencies:  
   Cocos Island Region:
      Enhanced by 15% during local day,
      Depressed by 15% at times during local night.
   Niue Island Region:
      Enhanced by 15% during local day,
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

 
2. FORECAST (22 APRIL - 28 APRIL)
Solar: 
Moderate activity possible early in week,
otherwise mostly low solar activity levels expected.

Geomagnetic:  
Mostly quiet to unsettled conditions.

Frequencies:  
MUFs near predicted monthly values.

For an explanation of some of the terms in this report, go to
http://www.ips.gov.au/1/2/1.

IPS Radio and Space Services        email: asfc at ips.gov.au
PO Box 1386                         WWW: http://www.ips.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp.ips.gov.au 
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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