[Ips-dsgr] ASWFC Daily Report - 14 April 26 issued 2330 UT on 14 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Apr 15 09:30:49 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/14 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 14 APRIL AND FORECAST FOR 15 APRIL - 17 APRIL
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 14 Apr: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 14 Apr: 101/49
1B. SOLAR FORECAST
15 Apr 16 Apr 17 Apr
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 105/54 110/60 110/60
COMMENT: Solar flare activity was at the R0 level during UT day
14-Apr, with no C-class or greater flares observed during this
period. There are currently three active regions on the visible
solar disk, with Active Region (AR) 4416 (N19W41, beta) being
the largest. This region has remained largely stable over the
last 24 hours, along with AR 4415 (S18W08, alpha). AR 4419 (N13E57,
beta) has shown minor growth over the past UT day. Solar flare
activity is forecast to remain at the R0 level over 15-17 Apr.
S0 solar proton conditions persisted throughout UT day 14-Apr
with proton flux remaining at background levels. S0 solar proton
conditions are forecast over 15-17 Apr. No geoeffective coronal
mass ejections (CMEs) were observed over the past UT day. Further
analysis of the CME first observed at 13/1812UT confirms that
it does not contain a geoeffective component. A second, low-velocity,
east-directed CME was visible in SOHO/LASCO imagery from 13/2200UT.
This CME has been modelled not to impact the Earth. The solar
wind speed continued a slow decline toward background levels,
with the speed dropping from approximately 400 km/s early in
the UT day to around 350 km/s by the end of the UT day. The interplanetary
magnetic field strength (IMF, Bt) was largely stable throughout
the UT day, peaking at 6 nT, with the north-south component (Bz)
ranging between -4 and +4 nT. The solar wind speed is expected
to remain at background levels through 15-17 Apr, with a possible
increase late on 17-Apr as an equatorial coronal hole moves into
a geoeffective position.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 14 Apr: G0
Estimated Indices 14 Apr : A K
Australian Region 1 11000001
Cocos Island 0 10000000
Darwin 2 21100011
Townsville 2 21011101
Learmonth 1 11000101
Alice Springs 0 11000000
Gingin 0 01000001
Canberra 1 11010000
Kennaook Cape Grim 1 10011100
Hobart 1 10011001
Estimated Antarctic Regional K Indices 14 Apr :
Macquarie Island 1 00021000
Casey 5 23311100
Mawson 5 42102100
Observed Regional daily pc3 Indices 14 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 2 (Quiet)
Canberra 2 (Quiet)
Hobart 0 (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 14 Apr : A
Fredericksburg 7
Planetary 6
Observed AFr/Ap Indices 13 Apr : A K
Fredericksburg 3
Planetary 3 1111 0101
2B. MAGNETIC FORECAST
Date Ap Conditions
15 Apr 5 G0
16 Apr 5 G0
17 Apr 6 G0
COMMENT: Geomagnetic conditions in the Australian region were
at the G0 level, with G0 geomagnetic conditions also recorded
in the Antarctic region and at the planetary level. G0 geomagnetic
conditions are forecast for 15-17 Apr.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
14 Apr Fair-normal Normal-fair Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
15 Apr Fair-normal Fair-normal Fair-normal
16 Apr Fair-normal Fair-normal Fair-normal
17 Apr Fair-normal Fair-normal Fair-normal
COMMENT: Global ionospheric conditions were fair to normal on
UT day 14-Apr, with some degradations observed mainly in high-
and low-latitude regions at different times of the UT day. Ionospheric
conditions are expected to remain fair to normal over 15-17 Apr.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
14 Apr 63
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Depressed by 30% during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Southern Australian Region:
Near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Mar 92
Apr 83
May 81
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
15 Apr 80 Near predicted monthly values
16 Apr 80 Near predicted monthly values
17 Apr 80 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were largely near predicted values during local daylight
hours. Depressions of up to 20% were observed in the Southern
Australian region, Niue Island, and the Cocos Islands during
local night hours. Spread-F was also reported in Hobart during
local night hours, and sporadic-E was also observed at Darwin.
MUFs are expected to remain near predicted monthly values over
15-17 Apr, with some mild depressions possible during local night
hours.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 13 Apr
Daily Proton Fluence >1 MeV: 4.1E+05
Daily Proton Fluence >10 MeV: 1.8E+04
Daily Electron Fluence >2 MeV: 7.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 9%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B2.6
DSCOVR Satellite Solar Wind Day Averaged Data for 13 Apr
Speed: 433 km/sec Density: 1.4 p/cc Temp: 96200 K Bz: 1 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
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Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
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