[Ips-dsgr] IPS Daily Report - 25 April 08

[rwc]

SUBJ: IPS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 25/2330Z APRIL 2008 BY IPS RADIO AND SPACE SERVICES
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 25 APRIL AND FORECAST FOR 26 APRIL - 28 APRIL
STATUS INDICATORS SOL:GREEN   MAG:GREEN     ION: GREEN
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1A. SOLAR SUMMARY
Activity 25 Apr:  Very low

Flares: none.

Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Apr:  70/5


1B. SOLAR FORECAST
             26 Apr             27 Apr             28 Apr
Activity     Very low           Very low           Very low
Fadeouts     None expected      None expected      None expected
10.7cm/SSN    70/5               70/5               70/5

COMMENT: Solar activity was Very Low over the last 24 hours, 
expected to continue next 3 days. The coronal hole high speed 
wind stream is waning, with solar wind speeds decreasing to 450km/s 
over the UT day. The Interplanetary Magnetic Field (IMF) was 
relatively stable. 'Upstream' STEREO observations indicate quiet 
solar wind/IMF conditions can be expected over the next 24 hours 
(26 Apr). 

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2A. MAGNETIC SUMMARY

Geomagnetic field for Australian Region 25 Apr: Quiet to unsettled 

Estimated Indices 25 Apr :  A   K           
   Australian Region       6   22222221
      Darwin               6   21222221
      Townsville           8   22232222
      Learmonth            6   22222221
      Camden               6   22222211
      Canberra             5   12222211
      Hobart               6   22222211
      Casey(Ant)          10   33322222
    
Observed Regional daily pc3 Indices 25 Apr : 
      Darwin               0   (Quiet)
      Townsville           0   (Quiet)
      Learmonth            2   (Quiet)
      Canberra             7   (Quiet)
      Hobart              39   (Quiet to unsettled)
Pc3 pulsations are high frequency (10-45 second period) variations 
of the Earths magnetic field. Daily pc3-indices are the daily sum 
of 20 minute pc3-indices for that station and have been shown to be
well correlated with rejection of high resolution aeromagnetic
survey flight-line data. 

NOTE: Indices may have been generated from data obtained in 
cooperation with the following organisations: Geoscience Australia, 
University of Newcastle Space Physics Group, Australian Government 
Antarctic Division and Space Environment Research Center, Japan.


Estimated AFr/Ap Indices 25 Apr : A 
           Fredericksburg         8
           Planetary             12                         

Observed AFr/Ap Indices 24 Apr :  A   K
           Fredericksburg        13
           Planetary             18   3443 3223     


2B. MAGNETIC FORECAST 
Date      Ap    Conditions
26 Apr     5    Quiet 
27 Apr     5    Quiet 
28 Apr     3    Quiet 

COMMENT: The geomagnetic field was mostly Quiet with some Unsettled 
periods over the UT day. Expect mostly Quiet conditions 26-28 
Apr with isolated Active periods at high latitudes 26 Apr. 

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3A. GLOBAL HF PROPAGATION SUMMARY
	            Latitude Band
Date        Low            Middle         High 
25 Apr      Normal         Normal         Fair           
PCA Event : No event.

3B. GLOBAL HF PROPAGATION FORECAST
	            Latitude Band
Date        Low            Middle         High 
26 Apr      Normal         Normal         Normal
27 Apr      Normal         Normal         Normal
28 Apr      Normal         Normal         Normal

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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY


Date   T index
25 Apr     8

Observed Australian Regional MUFs
near predicted monthly values

Predicted Monthly T index for April:   6

4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date   T index  MUFs
26 Apr     5    near predicted monthly values 
27 Apr     5    near predicted monthly values 
28 Apr     0    near predicted monthly values 

COMMENT: An unsettled geomagnetic field resulted in some degraded 
HF conditions over the UT day, particularly in the Antarctic 
regions and S.Aus. MUFs however were mostly near predicted monthly 
values. Some mild MUF depressions were observed in S.Aus during 
the local day. Expect generally improving HF conditions 26-27 
Apr, with MUFs mostly near predicted monthly values. 

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5. SPACE ENVIRONMENT SUMMARY

GOES satellite data for 24 Apr
       Daily Proton Fluence >1 MeV:   2.8E+06
       Daily Proton Fluence >10 MeV:  1.7E+04
       Daily Electron Fluence >2 MeV: 3.00E+08   (moderate fluence)   
Electron Fluence Daily Deep Dielectric Discharge Probability:19%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
       X-ray background: A1.0

ACE Satellite Solar Wind Day Averaged Data for 24 Apr
Speed: 588 km/sec  Density:    0.9 p/cc  Temp:   202000 K  Bz:  -1 nT

(Courtesy Space Environment Center, Boulder USA)
ACE data can be incorrect during strong proton events.
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