[Ips-dsgr] SWS Daily Report - 25 April 20 issued 2332 UT on 25 Apr 2020
rwc
rwc at ips.gov.au
Sun Apr 26 09:32:58 EST 2020
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/25 APRIL 2020 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 25 APRIL AND FORECAST FOR 26 APRIL - 28 APRIL
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
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1A. SOLAR SUMMARY
Activity 25 Apr: Very low
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Apr: 69/3
1B. SOLAR FORECAST
26 Apr 27 Apr 28 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, 25 April. Very
low levels of solar activity are expected for the next three
UT days, 26-28 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 25 April, the solar wind speed varied between
370 to 450 km/s, and is currently around 380 km/s The total IMF
(Bt) varied between 1-7 nT early in the UT day, then steadied
and is currently varying between 3-4 nT. The north-south IMF
component (Bz) varied between -5 to 4 nT at the start of the
UT day, then became mainly northward between -1 to 3 nT. Solar
wind parameters are expected to stay mostly at nominal values
for the next three UT days, 26-28 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 25 Apr: Quiet
Estimated Indices 25 Apr : A K
Australian Region 2 22200000
Cocos Island 2 12200000
Darwin 2 22100001
Townsville 2 21200101
Learmonth 2 22200000
Alice Springs 2 21200001
Gingin 2 22200000
Canberra 1 21100000
Hobart 2 21211000
Estimated Antarctic Regional K Indices 25 Apr :
Macquarie Island 2 11210000
Casey 4 33200000
Mawson 11 34314200
Observed Regional daily pc3 Indices 25 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 21 (Quiet to unsettled)
Canberra 28 (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 25 Apr : A
Fredericksburg 5
Planetary 6
Observed AFr/Ap Indices 24 Apr : A K
Fredericksburg 6
Planetary 6 2010 1223
2B. MAGNETIC FORECAST
Date Ap Conditions
26 Apr 6 Quiet, with a chance of isolated Unsettled periods
27 Apr 6 Quiet, with a chance of isolated Unsettled periods
28 Apr 6 Quiet, with a chance of isolated Unsettled periods
COMMENT: On UT day 25 April, the geomagnetic conditions in the
Australian region stayed at Quiet levels. The Antarctic region
observed mainly Quiet levels, with some Unsettled to Active periods.
Global geomagnetic conditions are expected to stay at mainly
Quiet levels for the next three UT days, 26-28 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
25 Apr Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
26 Apr Normal Normal Normal
27 Apr Normal Normal Normal
28 Apr Normal Normal Normal
COMMENT: Maximum usable frequencies (MUFs) were near predicted
monthly values with periods of minor to moderate enhancements
on UT day, 25 April. Mostly normal HF conditions may be expected
for the next three UT days, 26-28 April.
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
25 Apr 4
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Enhanced by 70% during local night.
Niue Island Region:
Near predicted monthly values during local day.
Enhanced by 25% 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 65% during local night.
Enhanced by 20% after local dawn.
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
26 Apr 2 Near predicted monthly values
27 Apr 2 Near predicted monthly values
28 Apr 2 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) were near predicted
monthly values with periods of minor to moderate enhancements
for the Australian region on UT day, 25 April. Sporadic E was
observed over some sites. Mostly normal HF conditions may be
expected in the Australian regions for the next three UT days,
26-28 April.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 24 Apr
Daily Proton Fluence >1 MeV: 1.4E+05
Daily Proton Fluence >10 MeV: 4.7E+04
Daily Electron Fluence >2 MeV: 5.40E+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 24 Apr
Speed: 374 km/sec Density: 5.3 p/cc Temp: 54900 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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