[Ips-dhfpr] IPS Daily HF Prop Report - 15 April 01

rwc rwc at ips.gov.au
Mon Apr 16 09:48:33 EST 2001


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 15/2330Z APRIL 2001 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (15 APRIL) 
Date   T index  Conditions    
15 Apr   119    Normal         

Flares    Max     Fadeout    Freq.  Sectors
X14/2B    1350UT  probable   all    European

Polar regions HF comms affected by proton event which beagn 1405UT on
15Apr following X14 flare.

MUFs:
   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.


Predicted Monthly T index for April: 120
2. FORECAST (16 APRIL - 18 APRIL)
Date   T index  Conditions       MUFs                              
16 Apr   100    Normal           Near predicted monthly values 
17 Apr   110    Normal-Fair      near predicted monthly values     
18 Apr    85    Fair             near predicted monthly values/depressed 
                                 10 to 20%    
COMMENT: IPS HF Communications Warning 24 was issued on 12 April 
and is current for interval 14-16 April. Degraded HF conditions 
expected late on 18 April due to anticipated geomagnetic activity 
from X14 flare. Effects are expected to be confined to mid to 
high latitudes (southern Aus/NZ region). 

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




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