[Ips-whfpr] IPS Weekly Prop. Report (16 April 08)

[rwc]

SUBJ: IPS WEEKLY HF PROPAGATION REPORT
ISSUED AT 16/0200Z APRIL 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (09 APRIL - 15 APRIL)
Date   T index   Conditions        
09 Apr    5      Normal            
MUFS:
   Equatorial PNG/Niue Region:
      Near predicted monthly values. Depressions to 60% at
      Vanimo 12-20 UT. Night spread F and afternoon sporadic
      E observed at Niue.
   Northern Australian Region:
      Near predicted monthly values. Depressions to 30%
      observed at Darwin and Townsville, 01-05 UT.
   Southern Australian and New Zealand Region:
      Near predicted monthly values. Night spread F observed
      at Hobart and Learmonth.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values to 30% depressed. Spread
      F observed.

10 Apr    6      Normal            
MUFS:
   Equatorial PNG/Niue Region:
      Near predicted monthly values. At Vanimo, MUFs were
      depressed 25% at 02 UT and enhanced to 30% 10-20 UT.
      At Niue, depressions to 40% were observed 00-01 and
      05-06 UT; some night spread F observed.
   Northern Australian Region:
      Near predicted monthly values with depressions to 30%
      observed at Darwin and Townsville 00-05 UT and Darwin
      10-12 UT. Some night spread F observed at Darwin and
      Brisbane.
   Southern Australian and New Zealand Region:
      Near predicted monthly values. Enhancements to 30%
      observed at Sydney and Canberra 14-20 UT. Night spread
      F observed at Hobart.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values to 30% depressed. Spread
      F observed.

11 Apr    2      Normal            
MUFS:
   Equatorial PNG/Niue Region:
      Variable conditions 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.

12 Apr    5      Normal            
MUFS:
   Equatorial PNG/Niue 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/Davis/Mawson):
      Near predicted monthly values over the UT day.

13 Apr   -1      Normal            
MUFS:
   Equatorial PNG/Niue Region:
      Near predicted monthly values. Depressions to 40%
      observed at Vanimo 06-07 and 14-15 UT. Depressions to
      30% at Niue 00-01, 06-07 and 20-21 UT.
   Northern Australian Region:
      Near predicted monthly values. Depressions to 40%
      03-06 UT.
   Southern Australian and New Zealand Region:
      Near predicted monthly values. Night spread F observed
      at Hobart.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values to 30% depressed.
      Enhancements to 40% at Scott Base 11-13 UT. Spread F
      observed.

14 Apr    3      Normal            
MUFS:
   Equatorial PNG/Niue 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/Davis/Mawson):
      Near predicted monthly values over the UT day.

15 Apr   -5      Normal            
MUFS:
   Equatorial PNG/Niue Region:
      Near predicted monthly values during local day,
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 20% during local day,
      Near predicted monthly values during local night.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 35% over the UT day.

Predicted Monthly T index for April:   6
2. FORECAST (16 APRIL - 22 APRIL) 
MUFS: Expected to be near predicted monthly values with 
isolated periods of depression ~20%. Depressed MUF's 
possible in the later half of this forecast period due to 
anticipated recurrent geomagnetic activity. Briefly 
depressed after local dawn on 22Apr.

Propagation conditions: Mostly normal, with Fair conditions
for 22Apr. No SWFs expected.

T index:   10

3. OUTLOOK (23 APRIL - 23 MAY)
Degraded HF propagation conditions possible:
23-Apr to 24-Apr,02-May,19-May to 21-May.

PLEASE 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.

For an explanation of some of the terms in this report, goto
http://www.ips.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.


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