[Ips-dhfpr] IPS Daily HF Prop Report - 11 April 01

rwc rwc at ips.gov.au
Thu Apr 12 09:31:00 EST 2001


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 11/2330Z APRIL 2001 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 APRIL) 
Date   T index  Conditions    
11 Apr   120    Fair           

Flares    Max     Fadeout    Freq.  Sectors
 M2/1F    1326UT  possible   lower  European

MUFs:
   Equatorial PNG Region:
      Enhanced by 15% during local day,
      Near predicted monthly values during local night.
      Depressed by 15% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values,
      Depressed by 40% after local dawn.
   Southern Australian and New Zealand Region:
      Mostly near predicted monthly values,
      Depressed by 55% after local dawn.
   Antarctic Region (Casey/Scott Base):
      Depressed by 40% over the UT day.


Predicted Monthly T index for April: 120
2. FORECAST (12 APRIL - 14 APRIL)
Date   T index  Conditions       MUFs                              
12 Apr     5    Poor             Depressed 50-60% for high latitudes. 
                                 Depressed 20-30% low to middle 
                                 latitudes. 
13 Apr    50    Fair             10 to 30% below predicted monthly 
                                 values     
14 Apr    90    Normal-Fair      about 15% below predicted monthly 
                                 values    
COMMENT: IPS HF Communications Warning 23 was issued on 10 April 
and is current for interval 11-13 April. Shortwave fadeouts expected 
on daylight HF circuits. Enhanced proton fluxes associated with 
both M7.9 and X2.3 flares from region 9415 on 9 Apr and 10 Apr 
are affecting high-latitude HF comms. 

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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