[Ips-dhfpr] IPS Daily HF Prop Report - 12 April 01

rwc rwc at ips.gov.au
Fri Apr 13 09:14:20 EST 2001


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 12/2330Z APRIL 2001 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 APRIL) 
Date   T index  Conditions    
12 Apr    70    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
 X2/--    1028UT  probable   all    European
 M1/1N    0304UT  possible   lower  E. Asia/Aust.

MUFs:
   Equatorial PNG Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian and New Zealand Region:
      Depressed by 45% during local day,
      Depressed by 15% during local night.
   Antarctic Region (Casey/Scott Base):
      PCA.


Predicted Monthly T index for April: 120
2. FORECAST (13 APRIL - 15 APRIL)
Date   T index  Conditions       MUFs                              
13 Apr    90    Fair             about 10% below predicted monthly 
                                 values 
14 Apr    90    Fair             about 15% below predicted monthly 
                                 values     
15 Apr    70    Fair             10 to 30% below predicted monthly 
                                 values    
COMMENT: IPS HF Communications Warning 24 was issued on 12 April 
and is current for interval 14-16 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. Further degraded propagation 
conditions are expected due to favorably located CME's associated 
with flares M2.3 1326UT/11 and an X2.0 1028UT/12. 

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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