[Ips-dsgr] SWS Daily Report - 22 April 19 issued 2330 UT on 22 Apr 2019

Regional Warning Centre rwc at ips.gov.au
Tue Apr 23 09:30:19 EST 2019


SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/22 APRIL 2019 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 22 APRIL AND FORECAST FOR 23 APRIL - 25 APRIL
STATUS INDICATORS SOL:GREEN   MAG:GREEN     ION: GREEN
-----------------------------------------------------------
1A. SOLAR SUMMARY
Activity 22 Apr:  Very low

Flares: none.

Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Apr:  69/3


1B. SOLAR FORECAST
             23 Apr             24 Apr             25 Apr
Activity     Very low           Very low           Very low
Fadeouts     None expected      None expected      None expected
10.7cm/SSN    69/3               69/3               69/3

COMMENT: Solar activity was Very Low for UT day 22 April. There 
are currently no sunspots on the solar disk visible from the 
Earth. Solar activity is expected to remain Very Low for the 
next 3 UT days, 23-25 April. No Earth-directed CMEs were observed 
in the available coronagraph imagery. On UT day 22 April, the 
solar wind speed stayed mostly between 350 km/s and 400 km/s, 
currently at 350 km/s. The total IMF (Bt) varied mostly between 
3 nT and 6 nT and the north-south component of the IMF (Bz) varied 
in the range -5/+4 nT. For the next UT day, 23 April, the solar 
wind speed is expected to be near its nominal levels with some 
possibility of slight strengthening due to high speed solar wind 
streams associated with a recurrent coronal hole in the southern 
hemisphere.

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2A. MAGNETIC SUMMARY

Geomagnetic field for Australian Region 22 Apr: Quiet

Estimated Indices 22 Apr : A   K           
   Australian Region       0   00100010
      Cocos Island         1   01100100
      Darwin               1   10100011
      Townsville           1   10101011
      Learmonth            1   00111010
      Alice Springs        0   00100010
      Culgoora             0   00100010
      Gingin               1   00100110
      Canberra             0   00100000
      Launceston           2   11101120
      Hobart               1   00101010    

Estimated Antarctic Regional K Indices 22 Apr :
      Macquarie Island     0   00001010
      Casey                5   32221100
      Mawson               5   11212113
      Davis                4   12222200

Observed Regional daily pc3 Indices 22 Apr : 
      Darwin               0   (Quiet)
      Townsville          NA
      Learmonth            0   (Quiet)
      Alice Springs        0   (Quiet)
      Gingin               2   (Quiet)
      Canberra             4   (Quiet)
      Melbourne           NA

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 International Center for Space Weather 
Science and Education, Japan.


Estimated AFr/Ap Indices 22 Apr : A 
           Fredericksburg         4
           Planetary              4                         

Observed AFr/Ap Indices 21 Apr :  A   K
           Fredericksburg         4
           Planetary              6   1131 2221     


2B. MAGNETIC FORECAST 
Date      Ap    Conditions
23 Apr     8    Quiet to Unsettled
24 Apr     8    Quiet to Unsettled
25 Apr     8    Quiet to Unsettled

COMMENT: Geomagnetic activity was at Quiet levels across the 
Australian region and in Antarctica on UT day 22 April. Global 
geomagnetic conditions are expected to be at Quiet to Unsettled 
levels on 23-25 24 April. The expected increase in the geomagnetic 
activity is due to effects associated with a negative polarity 
recurrent coronal hole in the southern hemisphere.

-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
	            Latitude Band
Date        Low            Middle         High 
22 Apr      Normal         Normal         Normal-fair    

PCA Event : No event.

3B. GLOBAL HF PROPAGATION FORECAST
	            Latitude Band
Date        Low            Middle         High 
23 Apr      Normal         Normal         Normal-fair
24 Apr      Normal         Normal         Normal-fair
25 Apr      Normal         Normal         Normal-fair

COMMENT: Maximum usable frequencies (MUFs) ranged from near predicted 
monthly values to significantly enhanced over the last 24 hours. 
Mostly normal HF conditions and near predicted monthly MUFs are 
expected for the next three UT days, 23-25 April.

-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY


Date   T index
22 Apr     2

Observed Australian Regional MUFs
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 40% during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

Monthly T index:
Month  T index
Mar      -7
Apr      -12
May      -12

4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date   T index  MUFs
23 Apr     2    Near predicted monthly values
24 Apr     2    Near predicted monthly values
25 Apr     2    Near predicted monthly values

COMMENT: Maximum usable frequencies (MUFs) ranged from near predicted 
monthly values to significantly enhanced during the last 24 hours 
for Australian region. Mostly normal HF conditions and near predicted 
monthly MUFs are expected for the next three UT days, 23-25 April, 
in the Australian/NZ regions.

-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY

GOES satellite data for 21 Apr
       Daily Proton Fluence >1 MeV:   7.2E+05
       Daily Proton Fluence >10 MeV:  1.9E+04
       Daily Electron Fluence >2 MeV: 7.70E+06   (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 1%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
       X-ray background: A7.2

DSCOVR Satellite Solar Wind Day Averaged Data for 21 Apr
Speed: 339 km/sec  Density:    4.3 p/cc  Temp:    30600 K  Bz:   1 nT

(Courtesy Space Weather Prediction Center, Boulder USA)
-----------------------------------------------------------

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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