[Ips-dsgr] ASWFC Daily Report - 19 July 26 issued 2330 UT on 19 Jul 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Mon Jul 20 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/19 JULY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 19 JULY AND FORECAST FOR 20 JULY - 22 JULY
STATUS INDICATORS SOL:GREEN MAG:** RED ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
-----------------------------------------------------------
1A. SOLAR SUMMARY
Activity 19 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 19 Jul: 119/71
1B. SOLAR FORECAST
20 Jul 21 Jul 22 Jul
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 125/78 125/78
COMMENT: Solar flare activity on UT day 19-Jul was at the R0
level, with no significant flaring activity. There are currently
three numbered regions visible on the solar disk and one unnumbered
region. Active region (AR) 4492 (N15E68, beta) is the largest
on the disk and appears stable. Region 4489 (S07W15, beta) has
shown development in its trailer spots over the UT day. An unnumbered
region recently appeared near N01E25 (beta) and is showing spot
growth. All other regions are in decay. Solar flare activity
is expected to be at the R0 level over 20-22 Jul. S0 solar radiation
storm conditions were observed on UT day 19-Jul. S0 solar radiation
storm conditions are expected over 20-22 Jul. No Earth-directed
coronal mass ejections (CMEs) have been observed. The solar wind
speed on UT day 19-Jul decreased, ranging from 335 to 280 km/s
and is currently near 290 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 5 nT and the north-south
IMF component (Bz) range was -4 to +4 nT. A narrow, elongated
trans-equatorial coronal hole spanning both solar hemispheres
is currently nearing the central meridian, and is expected to
influence the solar wind speed on 22-Jul. The solar wind speed
is expected to remain at background levels over 20-21 Jul, then
increase on 22-Jul due to coronal hole high speed wind stream
effects from the aforementioned coronal hole feature.
-----------------------------------------------------------
2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 19 Jul: G0
Estimated Indices 19 Jul : A K
Australian Region 0 00100000
Cocos Island 0 01010000
Darwin 1 01100001
Townsville 1 01100011
Learmonth 0 00110000
Alice Springs 0 00100000
Gingin 0 00100010
Canberra 0 00000000
Kennaook Cape Grim 0 00000000
Hobart 0 00000000
Estimated Antarctic Regional K Indices 19 Jul :
Macquarie Island 0 00000000
Casey 2 12200010
Mawson 2 01010022
Observed Regional daily pc3 Indices 19 Jul :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (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 19 Jul : A
Fredericksburg 5
Planetary 4
Observed AFr/Ap Indices 18 Jul : A K
Fredericksburg 4
Planetary 5 2111 1111
2B. MAGNETIC FORECAST
Date Ap Conditions
20 Jul 4 G0
21 Jul 5 G0
22 Jul 25 G1, chance of G2
COMMENT: G0 geomagnetic conditions were observed in the planetary,
Australian and Antarctic regions on UT day 19-Jul. G0 planetary
geomagnetic conditions are expected over 20-21 Jul. G1 planetary
geomagnetic conditions are expected on 22-Jul, with a chance
of G2 due to coronal hole high speed wind stream effects from
a narrow, elongated coronal hole feature.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
19 Jul Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
20 Jul Normal Normal Normal
21 Jul Normal Normal Normal
22 Jul Fair Fair Fair-poor
COMMENT: Global high-frequency (HF) radio propagation conditions
were mostly normal on UT day 19-Jul. Global HF propagation conditions
are expected to be normal over 20-21 Jul. Fair conditions are
expected on 22-Jul due to anticipated geomagnetic activity.
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
19 Jul 59
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available 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
Jun 81
Jul 66
Aug 63
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
20 Jul 60 Near predicted monthly values
21 Jul 60 Near predicted monthly values
22 Jul 45 Depressed 15%/near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region on UT day 19-Jul were mostly near predicted monthly values,
with depressions up to 20% observed during local night hours
in the northern Australian region. Strong spread-F was observed
across the Australian region during local night hours. MUFs are
forecast to be near predicted monthly values over 20-21 Jul,
with some depressions possible during local night hours. MUFs
are expected to be near predicted values to 15% depressed on
22-Jul due to anticipated geomagnetic activity.
-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 18 Jul
Daily Proton Fluence >1 MeV: 1.5E+05
Daily Proton Fluence >10 MeV: 1.8E+04
Daily Electron Fluence >2 MeV: 8.00E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 9%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.2
DSCOVR Satellite Solar Wind Day Averaged Data for 18 Jul
Speed: 332 km/sec Density: 4.5 p/cc Temp: 77200 K Bz: 1 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
-----------------------------------------------------------
Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
More information about the ips-dsgr
mailing list