[Ips-dsgr] SWS Daily Report - 26 April 20 issued 2332 UT on 26 Apr 2020
rwc
rwc at ips.gov.au
Mon Apr 27 09:32:33 EST 2020
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/26 APRIL 2020 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 26 APRIL AND FORECAST FOR 27 APRIL - 29 APRIL
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
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1A. SOLAR SUMMARY
Activity 26 Apr: Very low
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 26 Apr: 69/3
1B. SOLAR FORECAST
27 Apr 28 Apr 29 Apr
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, 26 April. Very
Low levels of solar activity are expected for the next three
UT days, 27-29 April. The visible disc has one numbered sunspot
region, AR 2760, and there are no returning regions expected.
No Earth bound CMEs were observed in available LASCO and STEREO
images. During UT day 26 April, the solar wind speed varied between
360 to 430 km/s. The total IMF (Bt) varied between 1-6 nT, and
the north-south IMF component (Bz) varied between -6 to 3 nT.
Solar wind parameters are expected to stay mostly at nominal
values for the next three UT days, 27-29 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 26 Apr: Quiet
Estimated Indices 26 Apr : A K
Australian Region 4 11012222
Cocos Island 4 11011222
Darwin 5 22012212
Townsville 6 22122212
Learmonth 4 11012222
Alice Springs 4 11112212
Gingin 7 12012332
Canberra 4 11012222
Hobart 5 11022222
Estimated Antarctic Regional K Indices 26 Apr :
Macquarie Island 3 01022211
Casey 10 33313222
Mawson 24 24222356
Observed Regional daily pc3 Indices 26 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 2 (Quiet)
Canberra 9 (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 26 Apr : A
Fredericksburg 6
Planetary 7
Observed AFr/Ap Indices 25 Apr : A K
Fredericksburg 5
Planetary 6 3320 1212
2B. MAGNETIC FORECAST
Date Ap Conditions
27 Apr 7 Quiet, with chance of isolated Unsettled periods
28 Apr 7 Quiet, with chance of isolated Unsettled periods
29 Apr 7 Quiet, with chance of isolated Unsettled periods
COMMENT: On UT day 26 April, the geomagnetic conditions in the
Australian region were mainly at Quiet levels, with Gingin station
observing an isolated Unsettled period. The Antarctic region
observed mainly Quiet to Unsettled levels, with Mawson station
observing periods of Active and Minor to Moderate Storm levels.
Global geomagnetic conditions are expected to stay at mainly
Quiet levels for the next three UT days, 27-29 April, with a
chance of isolated Unsettled periods due to weak coronal hole
influences.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
26 Apr Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
27 Apr Normal Normal Normal
28 Apr Normal Normal Normal
29 Apr Normal Normal Normal
COMMENT: Maximum usable frequencies (MUFs) were near predicted
monthly values with periods of minor to moderate enhancements
on UT day 26 April. Mostly normal HF conditions are expected
for the next three UT days, 27-29 April.
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
26 Apr 5
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 30% during local day.
Enhanced by 75% during local night.
Niue Island Region:
Depressed by 15% during local day.
Enhanced by 15% during local night.
Northern Australian Region:
Near predicted monthly values.
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
27 Apr 2 Near predicted monthly values
28 Apr 2 Near predicted monthly values
29 Apr 2 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) were mainly near predicted
monthly values with periods of minor to moderate enhancements
for the Australian region on UT day 26 April. The Niue Island
Region experienced minor MUF depressions during the local day.
Sporadic E was observed over most sites. Mostly normal HF conditions
are expected in the Australian regions for the next three UT
days, 27-29 April.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 25 Apr
Daily Proton Fluence >1 MeV: 6.0E+04
Daily Proton Fluence >10 MeV: 4.7E+04
Daily Electron Fluence >2 MeV: 2.70E+06 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 1%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: <A1.0
DSCOVR Satellite Solar Wind Day Averaged Data for 25 Apr
Speed: 405 km/sec Density: 4.7 p/cc Temp: 68900 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
PO Box 1386 WWW: http://www.sws.bom.gov.au
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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