[Ips-wsgr] IPS Weekly Solar and Geophysical Report (21 December 07)

[rwc]

SUBJ: IPS WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 21 DECEMBER 2007, BY IPS RADIO AND SPACE SERVICES,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (14 DECEMBER - 20 DECEMBER)
Date     14    15    16    17    18    19    20
10cm     92    89    82    80    77    75    73
AFr       2     2     1    12    11     7 ( 10)
Aaus      5     4     5    20    16     8 ( 13)
T        -6   -12   -19     7   -16   -25   -11

Solar:        Solar flare activity
Geomagnetic:  Geomagnetic activity observed for Australian Region.
Frequencies:  Australian Ionospheric F2 critical frequencies

14 Dec 
Solar:        low
Geomagnetic:  Quiet 

Frequencies:  
   Equatorial PNG/Niue Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
   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.

15 Dec 
Solar:        very low
Geomagnetic:  Quiet 

Frequencies:  
   Equatorial PNG/Niue Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day,
      Depressed by 20% during local night.
   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.

16 Dec 
Solar:        low
Geomagnetic:  Quiet 

Frequencies:  
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 25% during local night.
   Northern Australian Region:
      Depressed by 15% during local day,
      Depressed by 25% during local night.
   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.

17 Dec 
Solar:        low
Geomagnetic:  Quiet to Active 
A weak (15nT) impulse was observed in the IPS magnetometer data at
0253UT on 17 Dec.
Frequencies:  
   Equatorial PNG/Niue Region:
      Mostly near predicted monthly values,
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 25% during local day,
      Enhanced by 35% during local night.
      Depressed by 20% after local dawn.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Enhanced by 15% during local night.
      Enhanced by 45% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

18 Dec 
Solar:        low
Geomagnetic:  Quiet to Active 

Frequencies:  
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values,
      Depressed by 25% after local dawn.
   Southern Australian and New Zealand Region:
      Depressed up to 30% at times during the local day,
      otherwise mostly near predicted monthly values,
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

19 Dec 
Solar:        very low
Geomagnetic:  Quiet to Unsettled 

Frequencies:  
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
   Northern Australian Region:
      Depressed by 15% during local day,
      Depressed by 25% during local night.
   Southern Australian and New Zealand Region:
      Depressed by 15% during local day,
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

20 Dec 
Solar:        very low
Geomagnetic:  Quiet to Active 

Frequencies:  
   Equatorial PNG/Niue Region:
      Mostly near predicted monthly values,
   Northern Australian Region:
      Near predicted monthly values during local day,
      Depressed by 15-30% during local night.
   Southern Australian and New Zealand Region:
      Near predicted monthly values during local day,
      Depressed by 15-30% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

 
2. FORECAST (21 DECEMBER - 27 DECEMBER)
Solar: Very low to low.

Geomagnetic: Isolated active periods possible 21-22 December,
otherwise mostly unsettled to quiet conditions expected.

Frequencies: MUFs depressed 15-30% at times, otherwise mostly
near predicted monthly values. Mild to significant depressions
are expected at times due to very low solar activity levels.

For an explanation of some of the terms in this report, goto
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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