Alerts:
Space Weather Message Code: WARK04
Serial Number: 5083
Issue Time: 2025 Sep 17 1455 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5082
Valid From: 2025 Sep 14 2015 UTC
Now Valid Until: 2025 Sep 14 2100 UTC
Warning Condition: Persistence
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: ALTEF3
Serial Number: 3526
Issue Time: 2025 Sep 17 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3525
Begin Time: 2025 Sep 16 1100 UTC
Yesterday Maximum 2MeV Flux: 3347 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar-terrestrial indices for 17 September follow.
Solar flux 147 and estimated planetary A-index 12.
The estimated planetary K-index at 0000 UTC on 18 September was 2.67.
No space weather storms were observed for the past 24 hours.
No space weather storms are predicted for the next 24 hours.
Geo Magnetic Forecast:
NOAA Ap Index Forecast
Observed Ap 16 Sep 021
Estimated Ap 17 Sep 011
Predicted Ap 18 Sep-20 Sep 010-005-005
NOAA Geomagnetic Activity Probabilities 18 Sep-20 Sep
Active 25/15/15
Minor storm 10/01/01
Moderate storm 01/01/01
Strong-Extreme storm 01/01/01
NOAA Kp index forecast 18 Sep - 20 Sep
Sep 18 Sep 19 Sep 20
00-03UT 2.33 1.67 1.67
03-06UT 3.00 1.33 1.33
06-09UT 3.00 1.33 1.33
09-12UT 2.33 1.33 1.33
12-15UT 1.67 1.33 1.33
15-18UT 1.67 1.33 1.33
18-21UT 2.00 1.67 1.67
21-00UT 2.33 1.67 1.67
Extended Three Day Forecast:
A. NOAA Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Sep 18-Sep 20 2025 is 3.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Sep 18-Sep 20 2025
Sep 18 Sep 19 Sep 20
00-03UT 2.33 1.67 1.67
03-06UT 3.00 1.33 1.33
06-09UT 3.00 1.33 1.33
09-12UT 2.33 1.33 1.33
12-15UT 1.67 1.33 1.33
15-18UT 1.67 1.33 1.33
18-21UT 2.00 1.67 1.67
21-00UT 2.33 1.67 1.67
Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No
significant transient or recurrent solar wind features are forecast.
B. NOAA Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
below S-scale storm level thresholds.
Solar Radiation Storm Forecast for Sep 18-Sep 20 2025
Sep 18 Sep 19 Sep 20
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected.
No significant active region activity favorable for radiation storm
production is forecast.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Sep 18-Sep 20 2025
Sep 18 Sep 19 Sep 20
R1-R2 35% 35% 35%
R3 or greater 1% 1% 1%
Rationale: There remains a chance for isolated R1-R2 (Minor-Moderate)
radio blackouts through 20 Sep.
Extended Space Weather Discussion:
Solar Activity
.24 hr Summary...
Solar activity was at low levels. Low level C-class flaring was observed
from Region 4216 (N10W04, Cai/beta-gamma). Slight growth occurred in
Regions 4216 and 4221 (N04E29, Dso/beta). Moderate growth was observed
in Region 4220 (S18W01, Dai/beta). Region 4217 (S17E36, Eao/beta)
exhibited separation in its leader spots. The rest of the spot groups
were either stable or in decay. No Earth-directed CMEs were observed.
.Forecast...
Solar activity is expected to be low, with a chance for an isolated
M-flare (R1-R2/Minor-Moderate), through 20 Sep.
Energetic Particle
.24 hr Summary...
The greater than 2 MeV electron flux reached high levels with a peak
flux of 4,340 pfu observed at 17/1610 UTC. The greater than 10 MeV
proton flux was at background levels.
.Forecast...
The greater than 2 MeV electron flux is expected to continue at moderate
to high levels through 20 Sep. The greater than 10 MeV proton flux is
expected to persist at background levels.
Solar Wind
.24 hr Summary...
Solar wind parameters were indicative of the waning influences of a
negative polarity CH HSS. Solar wind speed decreased from approximately
725 km/s to near 560 km/s. Total field ranged from 3-5 nT while the Bz
component was between +/-4 nT. Phi angle was mostly negative.
.Forecast...
HSS conditions are expected to continue to diminish through 18 Sep with
a return to nominal solar wind parameters on 19-20 Sep.
Geospace
.24 hr Summary...
The geomagnetic field was quiet to unsettled.
.Forecast...
Quiet to unsettled levels are expected on 18 Sep as HSS activity wanes.
A return to mostly quiet conditions is expected on 19-20 Sep.
27 Day Forecast:
Date | Radio Flux | Planetary A Index | Largest Kp Index
2025 Sep 15 125 30 6
2025 Sep 16 120 12 4
2025 Sep 17 125 10 3
2025 Sep 18 130 5 2
2025 Sep 19 135 5 2
2025 Sep 20 135 5 2
2025 Sep 21 135 5 2
2025 Sep 22 135 5 2
2025 Sep 23 130 5 2
2025 Sep 24 125 5 2
2025 Sep 25 130 5 2
2025 Sep 26 125 5 2
2025 Sep 27 125 5 2
2025 Sep 28 130 12 4
2025 Sep 29 130 15 5
2025 Sep 30 125 8 3
2025 Oct 01 120 5 2
2025 Oct 02 115 5 2
2025 Oct 03 115 15 5
2025 Oct 04 110 12 4
2025 Oct 05 110 12 4
2025 Oct 06 115 15 5
2025 Oct 07 115 12 4
2025 Oct 08 110 8 3
2025 Oct 09 115 8 3
2025 Oct 10 115 5 2
2025 Oct 11 120 15 5
v4.16b
v4.X Release 17th Dec 2020)
Fixed New GOES and HPI inputs from noaa for Json (17/12/20).
Addded the ability to add 2 custom Magnetometers in settings (comming soon) (18/10/19).
Improved Hobart Magnetometer code. (18/18/19)
Move all presets into their own pop out side menu. (19/06/19)
Added Composite weather maps (TAS, VIC and SA), thanks to Oz forecast! (19/06/19)
UI Upgrades, Name, Logo and Website Site Changes.
Added custom line widths for most items.
Added GOES Difference (#1 - #2)
Added Ovation-prime model outputs.
v3.8x
Various Updates, New AF Index Algo. (8/12/18)
v3.6x
Added more Presets. Disabled Presets overwriting graph views (6/7/18)
Added GeoSpace Kp Model Prediction. (3/7/18)
Added SWPC Kp Forecast + Observation. (2/7/18)
Removed WingKP and USKp. :( No longer Avaliable. (2/7/18)
Removed feed from www.dunedinaurora.nz (Unreliable). (2/7/18)
Updates to latest JQuery, JQuery Mobile and AmCharts etc. (2/7/18)
Enhanced Pro setting with Dynamic Preasure. (2/7/18)
Added Quickselect preset buttons to main page. (2/7/18)
v3.5x
Added Ruru Observatory Magnetometer. (25/4/28)
Added Forecast Sub Tabset. (1/3/18)
Added Extended Discussion Text, 27Day FC (1/3/18)
Removed Dial, and Added Forecast Report. (28/2/18)
Updated A few settings for better visilation. (28/2/18)
Updated Goes-13 is Now Goes-14 (15/2/18)
Improved Commmunity Activity for faster loads.
Consolidated Proton Density / Dynamic Preasure.
Added Additional Balloon Text.
Added TAFS Visual Probability in %.
User Interface Upgrades.
Add 'Dial' for the basics, with default support.
Added one click presets.
v2.1 - v2.49
Added 'Automatic Chart Update' option in settings.
Database caching enabled, significant load time improvements.
Extension to max 96 hours of data, up from 24.
Added ACE Bt,Bx and By for comparison.
Added More User Presets.
Fixed Orentation Change Alert.
Small layout changes.
Added Header Image.
Removed Top Header to fee up Space, Refresh added to Chart Tab.
Added Community Activity Indicator
Fixed MAG value issues in graph.
Added Second Hobart MAG Source.
Updated Comment Features (Disable).
v2.0
Fixed DSCOVR B? display bug.
Added MAG Stack Feature.
Upgrade to json feeds.
Feeds are timezone and forecast aware, making them super fast.
DB Optimisation, improved DB search times.
Charts are now zoomable, allow selection and export.
Added USAF Kp, Updated Wing Kp.
Added Ovation Aurora Short Term Forecast.
Added Macquarie Island MAG feed.
Added Mawson MAG Feed.
Added Canberra Feed.
Added MAG feed from www.dunedinaurora.nz (Portobello).
Added Brendan's experemental MAG feed (Hobart).
Fixed cookie bug, One Alert is enough for landscape mode.
> v1.0 (Started 20/10/2014)
Mawson and Macquarie Island data is copyright Commonwealth of Australia (Geoscience Australia), and redistributed under Creative Commons v4.
Thanks to INTERMAGNET for promoting high standards of magnetic observatory practice in providing access to these feeds. (www.intermagnet.org).
Local Australian weather composite maps provided by Oz Forecast