[Ips-dsgr] SWS Daily Report - 24 April 20 issued 2338 UT on 24 Apr 2020

Sat Apr 25 09:38:09 EST 2020

SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/24 APRIL 2020 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 24 APRIL AND FORECAST FOR 25 APRIL - 27 APRIL
STATUS INDICATORS SOL:GREEN   MAG:GREEN     ION: GREEN
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1A. SOLAR SUMMARY
Activity 24 Apr:  Very low

Flares: none.

Observed 10.7 cm flux/Equivalent Sunspot Number for 24 Apr:  71/6

1B. SOLAR FORECAST
             25 Apr             26 Apr             27 Apr
Activity     Very low           Very low           Very low
Fadeouts     None expected      None expected      None expected
10.7cm/SSN    71/6               71/6               71/6

COMMENT: Solar activity was very low on UT day, 24 April. Very 
low levels of solar activity are expected for the next three 
UT days, 25-27 April. The visible disc has been spotless and 
there are no returning regions expected. No Earth bound CMEs 
observed in available LASCO and STEREO images. During UT day 
24 April, the solar wind speed varied between 350 to 400 km/s. 
The total IMF (Bt) varied between 2 to 8 nT and the north-south 
IMF component (Bz) varied between -7 to 5 nT. Solar wind parameters 
are expected to stay mostly at nominal values for the next three 
UT days, 25-27 April, with the possibility of occasional slight 
strengthenings due to weak coronal hole influences.

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2A. MAGNETIC SUMMARY

Geomagnetic field for Australian Region 24 Apr: Quiet

Estimated Indices 24 Apr : A   K           
   Australian Region       5   21111222
      Cocos Island         3   21110211
      Darwin               3   21100221
      Townsville           5   21111222
      Learmonth            5   21211222
      Alice Springs        3   11100222
      Gingin               4   20201222
      Canberra             3   11101121
      Hobart               4   11211122    

Estimated Antarctic Regional K Indices 24 Apr :
      Macquarie Island     1   10010011
      Casey                7   32301222
      Mawson              19   52212245

Observed Regional daily pc3 Indices 24 Apr : 
      Darwin               0   (Quiet)
      Townsville           0   (Quiet)
      Learmonth            0   (Quiet)
      Alice Springs        0   (Quiet)
      Gingin              15   (Quiet)
      Canberra            31   (Quiet to unsettled)
      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 24 Apr : A 
           Fredericksburg         6
           Planetary              6                         

Observed AFr/Ap Indices 23 Apr :  A   K
           Fredericksburg         4
           Planetary              5   1111 1212     

2B. MAGNETIC FORECAST 
Date      Ap    Conditions
25 Apr     5    Quiet, with chance of isolated Unsettled periods
26 Apr     5    Quiet, with chance of isolated Unsettled periods
27 Apr     5    Quiet, with chance of isolated Unsettled periods

COMMENT: On UT day 24 April, the geomagnetic conditions in the 
Australian and Antarctic regions stayed at Quiet levels. Some 
isolated Unsettled conditions were also recorded in the Antarctic 
region, with Mawson stations experience some periods of Active 
to Minor Storm levels. Global geomagnetic conditions are expected 
to stay at Quiet levels for the next three UT days, 25-27 April, 
with a chance of isolated Unsettled periods due weak coronal 
hole influences.

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3A. GLOBAL HF PROPAGATION SUMMARY
	            Latitude Band
Date        Low            Middle         High 
24 Apr      Normal         Normal         Normal         

PCA Event : No event.

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

COMMENT: Maximum usable frequencies (MUFs) were near predicted 
monthly values with periods of minor to moderate enhancements 
on UT day, 24 April. Mostly normal HF conditions may be expected 
for the next three UT days, 25-27 April.

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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY

Date   T index
24 Apr    -2

Observed Australian Regional MUFs
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 60% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
   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 35% 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      1
Apr      -14
May      -14

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

COMMENT: Maximum usable frequencies (MUFs) were near predicted 
monthly values with periods of minor to moderate enhancements 
for the Australian region on UT day, 24 April. Mostly normal 
HF conditions may be expected in the Australian regions for the 
next three UT days, 25-27 April.

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5. SPACE ENVIRONMENT SUMMARY

GOES satellite data for 23 Apr
       Daily Proton Fluence >1 MeV:   7.2E+04
       Daily Proton Fluence >10 MeV:  4.7E+04
       Daily Electron Fluence >2 MeV: 9.10E+06
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
       X-ray background: <A1.0

DSCOVR Satellite Solar Wind Day Averaged Data for 23 Apr
Speed: 405 km/sec  Density:    5.0 p/cc  Temp:    43300 K  Bz:   1 nT

(Courtesy Space Weather Prediction Center, Boulder USA)
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Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
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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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