Alerts:
Space Weather Message Code: ALTEF3
Serial Number: 3705
Issue Time: 2026 Jun 27 0713 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3704
Begin Time: 2026 Jun 26 1345 UTC
Yesterday Maximum 2MeV Flux: 1636 pfu
Solar-terrestrial indices for 26 June follow.
Solar flux 163 and estimated planetary A-index 11.
The estimated planetary K-index at 1500 UTC on 27 June was 1.67.
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 25 Jun 025
Estimated Ap 26 Jun 011
Predicted Ap 27 Jun-29 Jun 012-015-005
NOAA Geomagnetic Activity Probabilities 27 Jun-29 Jun
Active 35/35/10
Minor storm 25/25/01
Moderate storm 10/10/01
Strong-Extreme storm 01/01/01
NOAA Kp index forecast 27 Jun - 29 Jun
Jun 27 Jun 28 Jun 29
00-03UT 3.00 3.33 1.67
03-06UT 3.67 3.67 1.33
06-09UT 2.00 4.00 1.33
09-12UT 2.67 3.00 1.33
12-15UT 2.00 2.00 1.33
15-18UT 2.00 1.67 1.33
18-21UT 2.67 2.67 1.67
21-00UT 3.00 2.67 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 Jun 27-Jun 29 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Jun 27-Jun 29 2026
Jun 27 Jun 28 Jun 29
00-03UT 2.67 3.33 1.67
03-06UT 2.00 3.67 1.33
06-09UT 2.00 4.00 1.33
09-12UT 1.33 3.00 1.33
12-15UT 2.00 2.00 1.33
15-18UT 2.00 1.67 1.33
18-21UT 2.33 2.67 1.67
21-00UT 3.00 2.67 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 Jun 27-Jun 29 2026
Jun 27 Jun 28 Jun 29
S1 or greater 5% 5% 5%
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 Jun 27-Jun 29 2026
Jun 27 Jun 28 Jun 29
R1-R2 50% 50% 50%
R3 or greater 10% 10% 10%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts,
and a slight chance for isolated R3 (Strong or greater) events,
primarily due to the potential of Regions 4475 and 4478.
Extended Space Weather Discussion:
Solar Activity
.24 hr Summary...
Solar activity was at low levels. Region 4478 (S06E41,
Fkc/beta-gamma-delta) continued to develop intermediate spots, observed
overall growth, and maintained a weak delta configuration. This region
was responsible for the largest flare of the period, a C5.7/ Sf at
26/1248 UTC, as well as several other C-class flares. Despite an overall
decaying trend, Region 4475 (S10W14, Dai/beta-gamma) added multiple
C-class flares during the period as well. Regions 4477 (S15E20,
Eao/beta) and 4479 (N15E23, Dao/beta) also exhibited development during
the period, yet both remained mostly quiet. Region 4476 (N08W37,
Axx/alpha) continued to decay and was inactive.
A CME first observed in GOES CCOR-1 coronagraph imagery at
approximately 26/2230 UTC was analyzed and determined to likely have at
least a partially Earth-directed component. Anticipated arrival at Earth
will likely be early on 30 Jun.
.Forecast...
Solar activity is expected to continue at predominately low levels on
27-29 Jun, with a chance for M-flares (R1-R2/Minor-Moderate) and a
slight chance for X-flares (R3/Strong or greater), primarily due to the
potential of Regions 4475 and 4478.
Energetic Particles
.24 hr Summary...
The greater than 2 MeV electron flux reached high levels and reached a
maximum flux of 1,636 pfu at 26/1740 UTC. The greater than 10 MeV proton
flux was at background levels.
.Forecast...
The greater than 2 MeV electron flux is expected to remain elevated to
moderate to high levels over 27-29 Jun. The greater than 10 MeV proton
flux is expected to persist at background levels through 29 Jun.
Solar Wind
.24 hr Summary...
Solar wind parameters were still slightly elevated this period as
negative polarity coronal hole high speed stream influences weakened.
Total magnetic field strength averaged around 5 nT. The Bz component
rotated between +/-5 nT early before turning mostly northward by the end
of the period. Solar wind speed was near 650 km/s for most of the period
before slowly decreasing to ~560 km/s by the end of the period. Phi was
mostly in a negative (towards the Sun) orientation.
.Forecast...
Solar wind conditions are expected reflect the continued weakening of
the negative polarity CH HSS through 27 Jun. Early on 28 Jun, a CME that
left the Sun on 22 Jun is anticipated to arrive at Earth, providing
additional enhancements to the near-Earth environment. A gradual return
to a more normal background state is expected on 29 Jun.
Geospace
.24 hr Summary...
The geomagnetic field was at quiet to unsettled conditions.
.Forecast...
Periods of active conditions are likely on 27-28 Jun due to the negative
polarity CH HSS influences and a potential CME arrival on 28 Jun. Mostly
quiet conditions are expected on 29 Jun.
27 Day Forecast:
Date | Radio Flux | Planetary A Index | Largest Kp Index
2026 Jun 22 120 5 2
2026 Jun 23 120 5 2
2026 Jun 24 120 12 4
2026 Jun 25 125 12 4
2026 Jun 26 130 10 3
2026 Jun 27 130 8 3
2026 Jun 28 130 5 2
2026 Jun 29 132 5 2
2026 Jun 30 135 5 2
2026 Jul 01 145 5 2
2026 Jul 02 138 5 2
2026 Jul 03 140 18 5
2026 Jul 04 135 15 4
2026 Jul 05 130 12 4
2026 Jul 06 130 10 3
2026 Jul 07 130 5 2
2026 Jul 08 125 12 4
2026 Jul 09 126 10 3
2026 Jul 10 120 8 3
2026 Jul 11 122 5 2
2026 Jul 12 118 6 2
2026 Jul 13 116 6 2
2026 Jul 14 115 6 2
2026 Jul 15 120 6 2
2026 Jul 16 125 12 4
2026 Jul 17 125 10 3
2026 Jul 18 122 6 2
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)
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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)
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Updated Goes-13 is Now Goes-14 (15/2/18)
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DB Optimisation, improved DB search times.
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Added USAF Kp, Updated Wing Kp.
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Added Macquarie Island MAG feed.
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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).
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