Alerts:
none
Solar-terrestrial indices for 29 April follow.
Solar flux 143 and estimated planetary A-index 4.
The estimated planetary K-index at 0300 UTC on 30 April was 2.33.
No space weather storms were observed for the past 24 hours.
Space weather for the next 24 hours is predicted to be moderate.
Radio blackouts reaching the R2 level are likely.
Geo Magnetic Forecast:
NOAA Ap Index Forecast
Observed Ap 28 Apr 003
Estimated Ap 29 Apr 004
Predicted Ap 30 Apr-02 May 014-008-005
NOAA Geomagnetic Activity Probabilities 30 Apr-02 May
Active 40/15/20
Minor storm 25/05/01
Moderate storm 10/01/01
Strong-Extreme storm 01/01/01
NOAA Kp index forecast 30 Apr - 02 May
Apr 30 May 01 May 02
00-03UT 2.67 2.67 1.67
03-06UT 2.67 2.33 1.67
06-09UT 2.33 2.33 1.67
09-12UT 1.67 2.00 1.33
12-15UT 2.67 2.00 1.33
15-18UT 3.00 2.00 1.33
18-21UT 3.67 2.33 1.33
21-00UT 3.67 2.00 1.33
Extended Three Day Forecast:
A. NOAA Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 1 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 29-May 01 2026 is 4.00 (below NOAA
Scale levels).
NOAA Kp index breakdown Apr 29-May 01 2026
Apr 29 Apr 30 May 01
00-03UT 0.33 4.00 3.00
03-06UT 0.67 3.33 2.67
06-09UT 1.00 2.67 2.67
09-12UT 1.33 3.00 2.33
12-15UT 1.00 2.33 2.00
15-18UT 1.00 2.33 2.00
18-21UT 1.33 2.00 2.00
21-00UT 1.67 3.00 2.33
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 Apr 29-May 01 2026
Apr 29 Apr 30 May 01
S1 or greater 15% 15% 15%
Rationale: There is a slight chance the greater than 10 MeV proton flux
could reach S1 (Minor) levels, but is mainly expected to remain at
background levels 29 Apr - 01 May.
C. NOAA Radio Blackout Activity and Forecast
Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 28 2026 1353 UTC.
Radio Blackout Forecast for Apr 29-May 01 2026
Apr 29 Apr 30 May 01
R1-R2 70% 70% 70%
R3 or greater 20% 20% 20%
Rationale: There is a high likelihood for R1/R2 (Minor/Moderate) radio
blackouts, and a slight chance for R3 (Strong or greater) events through
01 May, due primarily to the complexity of regions 4420 and 4425.
Extended Space Weather Discussion:
Solar Activity
.24 hr Summary...
Solar activity was at low levels with frequent C-class flaring observed
primarily from Regions 4420 (N16W56, Fkc/beta-gamma-delta) and 4425
(N05E10, Ekc/beta). The largest flare of the period was a C5.1/Sf at
29/0445 UTC from Region 4420. Region 4420 showed some slight decline in
areal extent with flux submergence noted in the trailing spots, though
rotation and consolidation in the leading spots persist and the region
retains its delta configuration. Region 4425 showed some movement in the
trailer spots with overall simplification, including loss of a delta
spot. Slight growth was observed in Regions 4423 (S10W39, Bxo/beta) and
4424 (N17W22, Eao/beta), with new flux emergence noted in both. Region
4428 (S24W00, Dai/beta) exhibited growth with separation of the bipoles.
Region 4427 (S30E13, Axx/alpha) remained an unremarkable unipolar spot
in decay.
No Earth-directed CMEs were observed in available coronagraph imagery.
.Forecast...
Solar activity is likely to reach moderate levels (R1-R2,
Minor-Moderate) over 30 Apr - 02 May with a slight chance for X-class
flares (R3-Strong or greater) due primarily to the flare potential of
regions 4420 and 4425.
Energetic Particle
.24 hr Summary...
The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels with a peak of 459 pfu observed at 29/1825
UTC. The greater than 10 MeV proton flux at geosynchronous orbit was at
background levels.
.Forecast...
The greater than 2 MeV electron flux is expected to increase to high
levels 30 Apr - 02 May in response to anticipated negative polarity CH
HSS (-CH HSS) influences. The greater than 10 MeV proton flux is
expected to remain at background levels, though a slight chance for S1
(Minor) solar radiation storm levels or greater exists through 02 May
due to the flare potential of Regions 4420 and 4425.
Solar Wind
.24 hr Summary...
Solar wind parameters were at near background levels throughout the
period. Solar wind speeds steadily declined from around 355 km/s early
in the period to near 310 km/s, with slight recovery to around 320 km/s
by end of period. Total magnetic field (Bt) strength remained weak,
ranging from 2-6 nT. The North-South (Bz) component was variable between
+5/-4 nT with a sustained southward deflections observed between 29/0900
and 29/1700 UTC. The phi angle was predominantly in a positive (away
from the Sun) orientation throughout the period, with the most notable
deviation to the negative sector occurring from approximately 29/1200 to
29/1600 UTC, before returning to a positive orientation and again
transitioning back to negative by end of period.
.Forecast...
Solar wind parameters are expected to remain at near nominal levels into
early 30 Apr. The onset of a -CH HSS is anticipated by mid 30 Apr.
Enhanced conditions are expected to persist through 01 May, though
confidence is moderate given the relatively small source coronal hole. A
return to near nominal levels is expected by 02 May.
Geospace
.24 hr Summary...
The geomagnetic field was quiet.
.Forecast...
Active conditions are anticipated by mid to late 30 Apr with a chance
for G1 (Minor) due to the anticipated onset of the -CH HSS. Unsettled to
active conditions are expected to persist on 01 May with a return to
mostly quiet levels on 02 May as HSS influences wane.
27 Day Forecast:
Date | Radio Flux | Planetary A Index | Largest Kp Index
2026 Apr 27 155 12 4
2026 Apr 28 150 7 2
2026 Apr 29 150 10 3
2026 Apr 30 152 14 4
2026 May 01 152 8 3
2026 May 02 148 5 2
2026 May 03 142 8 3
2026 May 04 140 8 3
2026 May 05 140 5 2
2026 May 06 135 5 2
2026 May 07 135 20 5
2026 May 08 135 15 4
2026 May 09 120 8 3
2026 May 10 110 5 2
2026 May 11 115 5 2
2026 May 12 115 5 2
2026 May 13 120 5 2
2026 May 14 120 5 2
2026 May 15 118 25 5
2026 May 16 130 20 5
2026 May 17 135 20 4
2026 May 18 135 15 4
2026 May 19 135 5 2
2026 May 20 140 5 2
2026 May 21 140 8 3
2026 May 22 145 10 3
2026 May 23 145 12 4
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)
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Added GeoSpace Kp Model Prediction. (3/7/18)
Added SWPC Kp Forecast + Observation. (2/7/18)
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Removed feed from www.dunedinaurora.nz (Unreliable). (2/7/18)
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> 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