[Ips-dsgr] SWS Daily Report - 22 April 20 issued 2331 UT on 22 Apr 2020
Regional Warning Centre
rwc at ips.gov.au
Thu Apr 23 09:31:26 EST 2020
SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/22 APRIL 2020 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 22 APRIL AND FORECAST FOR 23 APRIL - 25 APRIL
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
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1A. SOLAR SUMMARY
Activity 22 Apr: Very low
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Apr: 71/6
1B. SOLAR FORECAST
23 Apr 24 Apr 25 Apr
Activity Very low Very low Very low
Fadeouts None expected None expected None expected
10.7cm/SSN 71/6 71/6 71/6
COMMENT: Solar activity was very low on UT day, 22 April. Very
low levels of solar activity are expected for the next three
UT days, 23-25 April. The visible disc has been spotless and
there are no returning regions expected. No Earth bound CMEs
observed in available LASCO and STEREO images. During UT day
22 April, the solar wind speed was above 500 km/s for some time
in the early hours, then stayed relatively steady above 450 km/s
from around 0500 UT to 1700 UT, and then gradually decreased
to nearly 430 km/s. The total IMF (Bt) gradually decreased from
5 nT to 3 nT. The north-south IMF component (Bz) stayed mostly
in the range +3/-5 nT. The solar wind particle density varied
between 3 ppcc and 7 ppcc. These observations seem consistent
with the previously anticipated coronal hole effects. Solar wind
parameters may show minor to moderate strengthening on UT day
23 April due to coronal hole effects and then decline to more
nominal values on 24 and 25 April.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 22 Apr: Quiet to Unsettled
Estimated Indices 22 Apr : A K
Australian Region 4 11113101
Darwin 3 11112101
Townsville 4 21113101
Learmonth 5 21113111
Alice Springs 3 11103101
Gingin 4 21013111
Canberra 1 11001000
Hobart 4 11103111
Estimated Antarctic Regional K Indices 22 Apr :
Macquarie Island 3 21013000
Casey 6 32212111
Mawson 20 54222235
Observed Regional daily pc3 Indices 22 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 2 (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 22 Apr : A
Fredericksburg 7
Planetary 8
Observed AFr/Ap Indices 21 Apr : A K
Fredericksburg 8
Planetary 9 1202 332NA
2B. MAGNETIC FORECAST
Date Ap Conditions
23 Apr 10 Quiet to Unsettled
24 Apr 6 Quiet
25 Apr 6 Quiet
COMMENT: On UT day 22 April, the geomagnetic conditions in the
Australian and Antarctic regions varied mostly from quiet to
unsettled levels. Short periods of isolated minor storm were
also recorded in the Antarctic region. Global geomagnetic conditions
may vary from quiet to unsettled levels on UT day 23 April and
stay mostly quiet on 24 and 25 April.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
22 Apr Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
23 Apr Normal Normal Normal
24 Apr Normal Normal Normal
25 Apr Normal Normal Normal
COMMENT: Maximum usable frequencies (MUFs) were near predicted
monthly values with periods of minor to significant enhancements
on UT day, 22 April. Mostly normal HF conditions may be expected
for the next three UT days, 23 to 25 April.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
22 Apr -1
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Enhanced by 50% 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 20% 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):
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
23 Apr 0 Near predicted monthly values
24 Apr 4 Near predicted monthly values
25 Apr 4 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) were near predicted
monthly values with periods of minor to significant enhancements
for the Australian region on UT day, 22 April. Mostly normal
HF conditions may be expected in the Australian regions for the
next three UT days, 23 to 25 April.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 21 Apr
Daily Proton Fluence >1 MeV: 9.2E+04
Daily Proton Fluence >10 MeV: 4.6E+04
Daily Electron Fluence >2 MeV: 1.20E+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 21 Apr
Speed: 367 km/sec Density: 7.3 p/cc Temp: 112000 K Bz: 0 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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