[Ips-dsgr] SWS Daily Report - 23 April 22 issued 2331 UT on 23 Apr 2022 [SEC=OFFICIAL]
Regional Warning Centre
rwc at ips.gov.au
Sun Apr 24 09:31:17 EST 2022
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/23 APRIL 2022 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 23 APRIL AND FORECAST FOR 24 APRIL - 26 APRIL
STATUS INDICATORS SOL:R1-R2 MAG:G0 ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 23 Apr: R0 - None
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 23 Apr: 160/114
1B. SOLAR FORECAST
24 Apr 25 Apr 26 Apr
Activity R1-R2 R1-R2 R1-R2
Fadeouts Possible Possible Possible
10.7cm/SSN 160/114 160/114 160/114
COMMENT: Solar flare activity on UT day 23-Apr was at the R0
level, with no M or X class flares observed. The recently flare
active pair of solar regions, AR2993 (N22W17) and AR2994 (N14W17),
have been relatively quiet, with AR2993 showing some decline
in intermediate spots, and AR2994 mostly stable though reported
to be showing an increase in spots. Both regions still have flare
potential, though perhaps slightly reduced. Solar activity is
expected to be in the R1-R2 range, with a slight chance of an
isolated R3 event. There are seven spotted regions on the solar
disk. Solar region AR2995 (N13E19) also shows some flare potential
but has so far remained flare quiet, the other regions are not
of significance. No Earth directed CMEs were observed. The solar
wind speed was steady and varied between 517/433 km/sec. The
total interplanetary magnetic field strength (IMF Bt) peaked
around 6 nT. The north-south IMF component (Bz) range was +5/-6
nT, with a mildly southward during the interval 06-14UT.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 23 Apr: G0
Estimated Indices 23 Apr : A K
Australian Region 7 22132222
Darwin 7 12132222
Townsville 8 22132213
Learmonth 8 22133222
Alice Springs 7 21132222
Gingin 8 21142222
Canberra 8 22133222
Hobart 9 11143222
Estimated Antarctic Regional K Indices 23 Apr :
Macquarie Island 17 11064312
Casey 11 33232223
Mawson 34 34433366
Observed Regional daily pc3 Indices 23 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 4 (Quiet)
Canberra 25 (Quiet to unsettled)
Hobart 19 (Quiet)
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 Apr : A
Fredericksburg 11
Planetary 14
Observed AFr/Ap Indices 22 Apr : A K
Fredericksburg 7
Planetary 7 1302 2222
2B. MAGNETIC FORECAST
Date Ap Conditions
24 Apr 8 G0 - None
25 Apr 8 G0 - None
26 Apr 5 G0 - None
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 23 Apr. An isolated G2 period was observed in
the Antarctic region. G0 conditions are likely 24-26 Apr
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
23 Apr Normal Normal Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
24 Apr Normal Normal Normal-fair
25 Apr Normal Normal Normal-fair
26 Apr Normal Normal Normal
COMMENT: HF conditions were mostly normal. Normal propagation
conditions are expected for 24-26 Apr with isolated short-wave
fadeouts possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
23 Apr 88
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 40% during local day.
Enhanced by 20% during local night.
Enhanced by 20% after local dawn.
Niue Island Region:
Enhanced by 35% during local day.
Enhanced by 15% during local night.
Northern Australian Region:
Enhanced by 20% during local day.
Enhanced by 55% during local night.
Enhanced by 40% after local dawn.
Southern Australian Region:
Enhanced by 25% during local day.
Enhanced by 30% during local night.
Enhanced by 20% after local dawn.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Enhanced by 30% over the UT day.
Monthly T index:
Month T index
Mar 64
Apr 46
May 49
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
24 Apr 80 Near to 15% above predicted monthly values
25 Apr 80 Near to 15% above predicted monthly values
26 Apr 80 Near to 15% above predicted monthly values
COMMENT: SWS SWF HF Communications Warning 37 was issued on 21
April and is current for 22-24 Apr. Maximum usable frequencies
(MUFs) on UT day 23 Apr were enhanced over monthly predicted
values. Some periods of spread-F were observed at Brisbane and
Hobart during local night hours. MUFs are expected to be 15-20%
enhanced over monthly predicted values during 24-26 Apr. Isolated
short-wave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 22 Apr
Daily Proton Fluence >1 MeV: 1.5E+05
Daily Proton Fluence >10 MeV: 4.0E+04
Daily Electron Fluence >2 MeV: 9.00E+06 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 2%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.0
DSCOVR Satellite Solar Wind Day Averaged Data for 22 Apr
Speed: 459 km/sec Density: 6.3 p/cc Temp: 130000 K Bz: 1 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
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Bureau of Meteorology
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