[Ips-dsgr] SWS Daily Report - 23 August 19 issued 2331 UT on 23 Aug 2019
Regional Warning Centre
rwc at ips.gov.au
Sat Aug 24 09:31:34 EST 2019
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/23 AUGUST 2019 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 23 AUGUST AND FORECAST FOR 24 AUGUST - 26 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
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1A. SOLAR SUMMARY
Activity 23 Aug: Very low
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 23 Aug: 67/0
1B. SOLAR FORECAST
24 Aug 25 Aug 26 Aug
Activity Very low Very low Very low
Fadeouts None expected None expected None expected
10.7cm/SSN 67/0 67/0 67/0
COMMENT: Solar activity remained very low on UT day 23 August.
The visible solar disk is spotless. Very Low solar activity is
expected for the next three UT days, 24-26 August. There were
no Earth-directed CMEs observed in the available coronagraph
imagery. On UT day 23 August, the solar wind speed was near its
background level, around 360 Km/s. The total IMF (Bt) varied
in the range 2-5 nT. The north-south component of the IMF (Bz)
varied between -4 and +3 nT, mostly neutral. The solar wind speed
is expected to remain mainly at background level for the next
three UT days, 24-26 August.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 23 Aug: Quiet
Estimated Indices 23 Aug : A K
Australian Region 2 12210001
Cocos Island 1 11100100
Darwin 3 22210001
Townsville 4 32210011
Learmonth 3 22210010
Alice Springs 3 22210000
Gingin 1 11110100
Canberra 2 12110011
Launceston 3 12220011
Hobart 2 02110001
Estimated Antarctic Regional K Indices 23 Aug :
Macquarie Island 0 01010000
Casey 5 23220200
Mawson 8 23121014
Observed Regional daily pc3 Indices 23 Aug :
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 23 Aug : A
Fredericksburg 5
Planetary 5
Observed AFr/Ap Indices 22 Aug : A K
Fredericksburg 7
Planetary 5 1111 1122
2B. MAGNETIC FORECAST
Date Ap Conditions
24 Aug 5 Quiet
25 Aug 5 Quiet
26 Aug 5 Quiet
COMMENT: On UT day 23 August, Quiet levels of geomagnetic activity
were recorded in the Australian region. During the next three
UT days, 24-26 August, global geomagnetic activity is expected
to be mostly at Quiet levels.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
23 Aug Normal-fair Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
24 Aug Normal-fair Normal Normal
25 Aug Normal Normal Normal
26 Aug Normal Normal Normal
COMMENT: Mostly normal HF propagation conditions are expected
for the next three UT days, 24-26 August.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
23 Aug -3
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values.
Niue Island Region:
Mostly near predicted monthly values.
Depressed by 20% after local dawn.
Northern Australian Region:
Depressed by 15% during local day.
Near predicted monthly values during local night.
Southern Australian Region:
Near predicted monthly values during local day.
Enhanced by 15% during local night.
Enhanced by 25% after local dawn.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Jul -2
Aug -13
Sep -15
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
24 Aug -5 Near predicted monthly values
25 Aug -5 Near predicted monthly values
26 Aug -5 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) ranged mostly near
predicted monthly values during UT day 23 August. Mild depressions
were observed at times across Northern Australian and Equatorial
regions. Sporadic-E and Spread-F occurrences were observed over
some sites. MUFs are expected to range mostly near predicted
monthly levels for UT days 24-26 August.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 22 Aug
Daily Proton Fluence >1 MeV: 8.4E+05
Daily Proton Fluence >10 MeV: 2.1E+04
Daily Electron Fluence >2 MeV: 2.90E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 5%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: A5.7
DSCOVR Satellite Solar Wind Day Averaged Data for 22 Aug
Speed: 356 km/sec Density: 8.3 p/cc Temp: 25100 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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