[Ips-dsgr] SWS Daily Report - 28 April 18 issued 2330 UT on 28 Apr 2018 [SEC=UNCLASSIFIED]
Regional Warning Centre
rwc at ips.gov.au
Sun Apr 29 09:30:21 EST 2018
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/28 APRIL 2018 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: 70/5
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 at very low levels today (UT day
28 April). No Earth-directed CMEs were observed in the available
imagery during the last 24 hours. The solar wind speed varied
from 370 km/s to 400 km/s through the UT day today. The IMF Bt
varied mostly between 2 and 6 nT. The Bz component of IMF showed
variations between +4/-2 nT during most parts of the day today,
staying positive for longer periods of time. Very Low levels
of solar flare activity are expected for the next three UT days,
29 April-01 May.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 28 Apr: Quiet
Estimated Indices 28 Apr : A K
Australian Region 1 21001000
Cocos Island 2 21001100
Darwin 2 21001101
Townsville - --------
Learmonth 2 22001000
Alice Springs 1 11001001
Culgoora 2 21101001
Gingin 1 21001000
Canberra 1 11011000
Launceston 2 22011000
Hobart - --------
Estimated Antarctic Regional K Indices 28 Apr :
Macquarie Island 1 11010000
Casey 5 33201000
Mawson 7 43102111
Observed Regional daily pc3 Indices 28 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 9 (Quiet)
Canberra 21 (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 28 Apr : A
Fredericksburg 5
Planetary 5
Observed AFr/Ap Indices 27 Apr : A K
Fredericksburg 5
Planetary 6 1001 1323
2B. MAGNETIC FORECAST
Date Ap Conditions
29 Apr 4 Quiet
30 Apr 4 Quiet
01 May 4 Quiet
COMMENT: Geomagnetic conditions were quiet across the Australian
region during the UT day 28 April. Geomagnetic conditions in
the region are expected to stay at quiet levels for the next
three days (29 April to 01 May).
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
28 Apr Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
29 Apr Normal Normal Normal
30 Apr Normal Normal Normal
01 May Normal Normal Normal
COMMENT: MUFs were mainly near predicted monthly values with
periods of minor to moderate MUF enhancements recorded in some
mid- and high-latitude areas on UT day 28 April. HF conditions
may be expected to stay mostly at normal levels for the next
three days (29 April to 01 May).
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
28 Apr 7
Observed Australian Regional MUFs
Niue Island Region:
Mostly near predicted monthly values.
Northern Australian Region:
No data available during local day.
No data available during local night.
Southern Australian Region:
Near predicted monthly values during local day.
Enhanced by 15% during local night.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Enhanced by 30% over the UT day.
Monthly T index:
Month T index
Mar 2
Apr 2
May 1
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
29 Apr 6 Near predicted monthly values
30 Apr 6 Near predicted monthly values
01 May 6 Near predicted monthly values
COMMENT: MUFs were mainly near predicted monthly values over
most of the Aus/NZ region with periods of minor to moderate MUF
enhancements recorded in some southern areas on UT day 28 April.
HF conditions may be expected to stay mostly at normal levels
in the region for the next three days (29 April to 01 May).
-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 27 Apr
Daily Proton Fluence >1 MeV: 1.7E+06
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 1.20E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:12%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: A2.5
DSCOVR Satellite Solar Wind Day Averaged Data for 27 Apr
Speed: 377 km/sec Density: 8.4 p/cc Temp: 71300 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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