[Ips-dhfpr] IPS Daily HF Prop Report - 13 March 08

[rwc]

SUBJ: IPS DAILY HF PROPAGATION REPORT
ISSUED AT 13/2330Z MARCH 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 MARCH) 
Date   T index  Conditions    
13 Mar    -9    Normal         

Flares: none.

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 during local day,
      Depressed by 15% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Predicted Monthly T index for March:   6
2. FORECAST (14 MARCH - 16 MARCH)
Date   T index  Conditions       MUFs                              
14 Mar     0    Normal           0 to 5% below predicted monthly 
                                 values 
15 Mar     5    Normal           near predicted monthly values     
16 Mar     5    Normal           near predicted monthly values    
COMMENT: 1. MUFs were on average only just below monthly averages 
as geomagnetic activity directly from the coronal hole high-speed 
solar-wind stream was weak. However the moderate nightime MUF 
depressions at equatorial and near-equatorial latitudes may have 
been the response to an inner magnetosphere disturbance (see 
geomagnetic section). Equatorial latitudes may continue to have 
moderate enhancements and depressions as the post-coronal-hole 
effects resolve themselves. Ionospheric resilience appears greater 
than the last equinox. Expect mid-latitudes returning to mostly 
normal HF conditions over the next day or two. 2. Extensive spread-F 
and sporadic E (Es) were observed. (Niue: dusk to night Es; Vanimo: 
pre-dawn Es; Brisbane: Es night and pre-dawn; Learmonth: spread-F 
midnight-dawn; Camden: weak Es during the day; Hobart: night 
spread-F; Christchurch: night spread-F and pre-dawn Es) 3. Polar 
ionosphere continues moderately disturbed as usual with high 
spread-F occurrence due to extended southward IMF Bz and also 
enhanced Bz fluctuations. 
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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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