[Ips-wsgr] IPS Weekly Solar and Geophysical Report (20 April 01)

[rwc]

SUBJ: IPS WEEKLY SOLAR AND GEOPHYSICAL REPORT 
ISSUED ON 20 APRIL 2001, BY IPS RADIO AND SPACE SERVICES,
FROM THE AUSTRALIAN SPACE FORECAST CENTRE

1. SUMMARY (13 APRIL - 19 APRIL)
Date     13    14    15    16    17    18    19
10cm    137   139   134   123   126   132   145
AFr      31    13     9     7     4    22 ( 10)
Aaus     31    15     8     5     5    25 (  6)
T       134    94   119   132   126   123   133

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

13 Apr 
Solar:        very low
Geomagnetic:  Major storm 
Frequencies:  
   Equatorial PNG Region:
      Near predicted monthly values during local day,
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day,
      Enhanced by 20% during local night.
      Enhanced by 15% after local dawn.
   Southern Australian and New Zealand Region:
      Mostly near predicted monthly values,
      Depressed by 35% after local dawn.
   Antarctic Region (Casey/Scott Base):
      Enhanced 15% to depressed 15% and absorption over the UT day.


14 Apr 
Solar:        moderate, with an M1/SF at 1811UT
Geomagnetic:  Quiet to Active 
Frequencies:  
   Equatorial PNG Region:
      Mostly near predicted monthly values,
      Enhanced by 15% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Depressed by 35% during local day,
      Depressed by 25% during local night.
   Antarctic Region (Casey/Scott Base):
      Depressed by 15% over the UT day.


15 Apr 
Solar:        high, with an X14.4/2B at 1350UT
Geomagnetic:  Quiet to Unsettled 
Frequencies:  
   Equatorial PNG Region:
     Enhanced by 15% during local day,
     Near predicted monthly values during local night.
  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):
     Near predicted monthly values over the UT day.


16 Apr 
Solar:        moderate, with an M1 at 0622UT
Geomagnetic:  Quiet 
Frequencies:  
   Equatorial PNG Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base):
      Near predicted monthly values over the UT day.
      Absorption observed.


17 Apr 
Solar:        moderate, with an M1 at 2157UT
Geomagnetic:  Quiet to Unsettled 
Frequencies:  
   Equatorial PNG Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base):
      Near predicted monthly values over the UT day.


18 Apr 
Solar:        low
Geomagnetic:  Major storm declining to unsettled. 
Frequencies:  
   Equatorial PNG Region:
      Near predicted monthly values 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):
      PCA over the UT day


19 Apr 
Solar:        moderate, with an  M2/-- at 1135UT 
Geomagnetic:  Quiet to Unsettled 
Frequencies:  
near predicted monthly values

2. FORECAST (20 APRIL - 26 APRIL)
Solar:        Moderate

Geomagnetic:  Increased activity is possible near the end of
the period if CME's occur.

Frequencies:  Near predicted monthly values with the possibility
of SWF.

PEASE NOTE: 
At this time of the solar cycle, space weather conditions
are frequently determined by short timescale events, not
able to be forecasted a week in advance.

IPS Radio and Space Services      | email: asfc at ips.gov.au
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