[Ips-dhfpr] IPS Daily HF Prop Report - 10 April 01

rwc rwc at ips.gov.au
Wed Apr 11 09:30:57 EST 2001


SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 10/2330Z APRIL 2001 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 APRIL) 
Date   T index  Conditions    
10 Apr   131    Normal         

Flares    Max     Fadeout    Freq.  Sectors
 X2/3B    0526UT  probable   all    E. Asia/Aust.

MUFs:
   Equatorial PNG Region:
      Mostly near predicted monthly values,
   Northern Australian Region:
      Mostly near predicted monthly values,
      Enhanced by 15% after local dawn.
   Southern Australian and New Zealand Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base):
      Enhanced by 20% over the UT day.


Predicted Monthly T index for April: 120
2. FORECAST (11 APRIL - 13 APRIL)
Date   T index  Conditions       MUFs                              
11 Apr   100    Poor             depressed 10 to 20%/near predicted 
                                 monthly values 
12 Apr    85    Fair             10 to 20% below predicted monthly 
                                 values     
13 Apr   110    Normal           near predicted monthly values/depressed 
                                 10 to 20%    
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. Depressions are expected 
over the 11 to 13 Apr period after the anticipated arrival on 
11 Apr of two shocks associated with the M7.9 and X2.3 flares/CMEs 
observed after 1534UT on 9 Apr and 0517UT on 10 Apr, respectively. 

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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