[Ips-dsgr] SWS Daily Report - 28 April 20 issued 2331 UT on 28 Apr 2020
Regional Warning Centre
rwc at ips.gov.au
Wed Apr 29 09:31:27 EST 2020
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/28 APRIL 2020 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 28 APRIL AND FORECAST FOR 29 APRIL - 01 MAY
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
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1A. SOLAR SUMMARY
Activity 28 Apr: Very low
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 28 Apr: 69/3
1B. SOLAR FORECAST
29 Apr 30 Apr 01 May
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 on UT day 28 April. Very
low levels of solar activity are expected for the next three
UT days, 29 April to 01 May. The visible disc has two numbered
regions, AR2760 and AR2761. No returning regions are expected.
No Earth-bound CMEs were observed in the available LASCO and
STEREO images. During UT day 28 April, the solar wind speed varied
between 370 and 430 km/s. The total IMF (Bt) varied in the range
3-5 nT and the north-south IMF component (Bz) varied between
-4 and +3 nT. The solar wind speed is expected to stay mostly
near its background values for the next three UT days, 29 April
to 01 May, with the possibility of occasional enhancements due
to weak coronal hole influences.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 28 Apr: Quiet
Estimated Indices 28 Apr : A K
Australian Region 3 21111201
Cocos Island 2 11111101
Darwin 3 21111201
Townsville 4 21121201
Learmonth 3 11111201
Alice Springs 3 21111201
Gingin 3 21011201
Canberra 2 11021200
Hobart 3 11022201
Estimated Antarctic Regional K Indices 28 Apr :
Macquarie Island 4 10032200
Casey 6 23221211
Mawson 17 53221334
Observed Regional daily pc3 Indices 28 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (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 28 Apr : A
Fredericksburg 6
Planetary 8
Observed AFr/Ap Indices 27 Apr : A K
Fredericksburg 6
Planetary 7 3211 1222
2B. MAGNETIC FORECAST
Date Ap Conditions
29 Apr 7 Quiet
30 Apr 7 Quiet
01 May 7 Quiet
COMMENT: On UT day 28 April, the geomagnetic conditions in the
Australian region were at quiet levels. The Antarctic region
observed mostly quiet to unsettled levels, with Mawson station
observing periods of active and minor storm levels. Global geomagnetic
conditions are expected to stay mainly at quiet levels for the
next three UT days, 29 April to 01 May, with a chance of isolated
unsettled periods due to weak coronal hole influences.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
28 Apr Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
29 Apr Normal Normal Normal-fair
30 Apr Normal Normal Normal-fair
01 May Normal Normal Normal-fair
COMMENT: Maximum usable frequencies (MUFs) were near predicted
monthly values with periods of minor to moderate enhancements
on UT day 28 April. Mostly normal HF conditions are expected
for the next three UT days, 29 April to 01 May.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
28 Apr 9
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 20% during local day.
Enhanced by 80% during local night.
Niue Island Region:
Depressed by 15% during local day.
Enhanced by 20% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 35% during local night.
Southern Australian Region:
Near predicted monthly values during local day.
Enhanced by 40% during local night.
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
29 Apr 4 Near to 15% above predicted monthly values
30 Apr 4 Near to 15% above predicted monthly values
01 May 4 Near to 15% above predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) were mainly near predicted
monthly values with periods of minor to moderate enhancements
for the Australian regions on UT day 28 April. Sporadic E layers
were observed over most sites. Mostly normal HF propagation conditions
are expected in the Australian regions for the next three UT
days, 29 April to 01 May.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 27 Apr
Daily Proton Fluence >1 MeV: 5.6e+04
Daily Proton Fluence >10 MeV: 4.7e+04
Daily Electron Fluence >2 MeV: 1.90e+06
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: <A1.0
DSCOVR Satellite Solar Wind Day Averaged Data for 27 Apr
Speed: 412 km/sec Density: 3.9 p/cc Temp: 65100 K Bz: -2 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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