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27 Day

Alerts:
Space Weather Message Code: ALTTP2
Serial Number: 1488
Issue Time: 2026 May 23 2000 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 23 1941 UTC
Estimate Velocity: 932 km/s

Comment:

Solar-terrestrial indices for 23 May follow.
Solar flux 137 and estimated planetary A-index 3.
The estimated planetary K-index at 0000 UTC on 24 May was 0.67.

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 22 May 006
Estimated Ap 23 May 004
Predicted Ap 24 May-26 May 005-005-008

NOAA Geomagnetic Activity Probabilities 24 May-26 May
Active                15/10/15
Minor storm           05/05/10
Moderate storm        01/01/05
Strong-Extreme storm  01/01/01

NOAA Kp index forecast 24 May - 26 May
             May 24    May 25    May 26
00-03UT        1.67      1.67      1.33
03-06UT        1.67      1.33      2.00
06-09UT        1.33      1.33      2.33
09-12UT        1.33      1.33      2.00
12-15UT        1.33      1.67      2.00
15-18UT        1.33      1.33      2.00
18-21UT        1.33      1.67      2.00
21-00UT        1.67      1.33      3.00

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 May 24-May 26 2026 is 3.00 (below NOAA
Scale levels).

NOAA Kp index breakdown May 24-May 26 2026

             May 24       May 25       May 26
00-03UT       1.67         1.67         1.33
03-06UT       1.67         1.33         2.00
06-09UT       1.33         1.33         2.33
09-12UT       1.33         1.33         2.00
12-15UT       1.33         1.67         2.00
15-18UT       1.33         1.33         2.00
18-21UT       1.33         1.67         2.00
21-00UT       1.67         1.33         3.00

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-19 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 24-May 26 2026

              May 24  May 25  May 26
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 May 24-May 26 2026

              May 24        May 25        May 26
R1-R2           35%           35%           35%
R3 or greater    5%            5%            5%

Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio
blackouts over 24-26 May primarily due to Region 4441 and the complexity
and activity of new regions rotating from the eastern limb including
Region 4446.

Extended Space Weather Discussion:

Solar Activity

.24 hr Summary...
Solar activity was at low levels following several minor C-class flares,
the largest being a C3.6 at 23/0548 UTC. The majority of the flare
activity appeared to originate between newly numbered Region 4446
(S13E75, Dao/beta) and the East limb. Region 4441 (N09W71, Ehi/beta)
added a few flares as well, including the aforementioned C3.6 flare, and
a long-duration C2.8 flare at 23/1954 UTC. This flare had an associated
Type II radio sweep with an estimated shock speed of 932 km/s. The
majority of the CMEs noted in coronagraph imagery appear to have a
source location either from the limb or from the far side of the Sun. As
of this summary, no Earth-directed CMEs were observed in available
satellite imagery.

Aside from newly numbered Region 4446, several pores were noted in
various stages of development/decay throughout the visible disk. None
appeared to last long enough to number at this time, but will be
monitored throughout the period.

.Forecast...
Solar activity is expected to remain at low levels, with a chance for
isolated M-class flares (R1-R2/Minor-Moderate) on 24-26 May, primarily
due to the flare potential of Region 4441 and newly numbered Region
4446.

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux at geosynchronous orbit remained at
moderate to high levels, reaching a peak level of 4,016 pfu at 23/1555
UTC. The greater than 10 MeV proton flux at geosynchronous orbit
remained at background levels.

.Forecast...
The greater than 2 MeV electron flux is expected to remain at moderate
to high levels on 24-25 May before returning to low to moderate levels
on 26 May. The greater than 10 MeV proton flux is expected to remain at
background levels through 26 May.

Solar Wind

.24 hr Summary...
Solar wind parameters reflected near-background conditions. Wind speeds
averaged near 330 km/s, total magnetic field strength was steady near 3
nT, and the phi angle was predominantly in a negative orientation.

.Forecast...
Primarily ambient conditions are expected for 24-25 May under a
background solar wind regime. Late on 26 May, enhancements to the solar
wind environment are possible with the anticipated onset of a negative
polarity CH HSS.

Geospace

.24 hr Summary...
The geomagnetic field has been at quiet levels over the past 24 hours.

.Forecast...
Mostly quiet levels are anticipated on 24-25 May under a near-background
solar regime. Periods of unsettled conditions are possible, with a
chance for an isolated active period, late on 26 May with the likely
onset of an approaching -CH HSS.

27 Day Forecast:

Date | Radio Flux | Planetary A Index | Largest Kp Index
2026 May 18     105          21          5
2026 May 19     110          21          5
2026 May 20     115           8          3
2026 May 21     115          10          3
2026 May 22     110           8          3
2026 May 23     112           5          2
2026 May 24     112           5          2
2026 May 25     115           5          2
2026 May 26     115           5          2
2026 May 27     115          12          4
2026 May 28     120          10          3
2026 May 29     125           8          3
2026 May 30     130           8          3
2026 May 31     135           8          3
2026 Jun 01     130           5          2
2026 Jun 02     130           5          2
2026 Jun 03     130           5          2
2026 Jun 04     125          12          4
2026 Jun 05     120           5          2
2026 Jun 06     115           5          2
2026 Jun 07     110           5          2
2026 Jun 08     105           5          2
2026 Jun 09     105          10          3
2026 Jun 10     100           5          2
2026 Jun 11      95          30          6
2026 Jun 12      95          25          5
2026 Jun 13      95          12          4

Save as 'My Presets'

GRAPH OPTIONS: Learn more
It is recommended that you start out with the default options. As you get used to AF you can disable additional information and combine data series' together to maxamise the use of screen space.
From Date: (YYYY-MM-DD HH:MM). Leave empty for real-time.

Range: (in hours, WARNING 1 hour = ~10KB of data)
Local Time Zone:
Enable Forecast / Timeshift (Recommended) Enable Fixed Y Axis Values Combine Y Series (B*, Proton, Dyn Preasure & Kp). Show Axis Titles Show Graph Legend (Keys) Enable Auto Update (Range will be reduced to 2 hours) Enable Night Vision Red Theme

DATA SOURCES: Learn more
Some data sources can only be enabled or disabled via the tick box. Others are disabled using the slider set to 0, or enabled by setting the slider from 0.5 to 4. This number also represents the thinkness of the line plot onto the graph.
'The' Aurora Forecast Index: Learn more
These are two good options for predicting Auroras.

The Aurora Forecast Index takes into account many data sources. As a general rule if it stays high for many hours there is a good possibility of an Aurora present.

Aurora Forecast website usage is also a good indicator, as visitors to the site come from many traffic sources. General internet and community chatter transplating to visits is a great indicator.

AF Index (Experemental) AF Community Activity (Hits)
Planatary K Index (Kp): Learn more
The Kp number is a system of measuring aurora strength. The range goes from 0 to 9 (0 being calm, 1 very weak, all the way up to 9, which would represent a major geomagnetic storm with strong auroras visible).

Kp 5 and above is classified as a geomagnetic storm. Most Aurora Hunters consider prolonged 3+ or higher worth investigation.

SWPC Kp (Observation)
SWPC Kp (Prediction) GeoSpace Kp (Prediction) Wing Kp (Legacy : Date < 22/06/18)
Ovation (Model) Short Term Forecast (GW):' Learn more
The Ovation-Prime Model produced by SWPC calculates the energy interacting with the Earths magnetic field. This is a good indicator for Aurora activity.

Northern Hemisphere (Aurora Borealis) Southern Hemisphere (Aurora Australis)
DSCOVR Observatory (L1): Learn more

The DSCOVR or Deep Space Climate Obervatory sits 1.5 million Kilometers from Earth, between the Earth and the Sun in the L1 orbit point, the neutral gravity point between the Earth and the Sun. DSCOVR provides space weather readings, allowing for up to an hour of warning on weather events. This is why DSCOVR's data appears in the future on the graph.

Strong negative Bz direction is linked to Aurora's because the solar wind magnetic direction is in direct oposition with the Earths magnetic field.

Mag Bt (Total Strength) Mag Bx (X Axis) Mag By (Y Axis) Mag Bz (Z Axis) Solar Wind Speed Proton Density Dynamic Pressure (Calculated)
ACE Observatory (L1): Learn more

ACE or Advanced Composition Explorer sits 1.5 million Kilometers from Earth, between the Earth and the Sun in the L1 orbit point, the neutral gravity point between the Earth and the Sun. ACE has now been replaced by DSCOVR, but the data is still useful for comparing to DSCOVR.
Show ACE (When enabled the forecasting / timeshift feature will be disabled)
GOES Satalites: Learn more

GOES or Geostationary Operational Environmental Satellites sit 46 Kilometers above the Earth in geostationary orbit. They provide local space weather data and are a good indicator for current geomagnetic conditions.

Primary Secondary Variation (Pri - Sec)
Terrestrial Magnetometer Sources: Learn more
Terrestrial or surface magnetometers detect fluctuations in the Earths magnetic field from the ground.
These do not work as well as satalites as the magnetic field obsorbs some of the effects from the solar winds.
There is a mix of govenment and citizen science stations listed here, including two run by Aurora Forecast in Hobart.

Macquarie Island (Intermagnet / Geo Science Aus) Mawson (Intermagnet / Geo Science Aus) Canberra (Intermagnet / Geo Science Aus) Ruru Obseratory (www.ruruobseratory.org.nz / NZ) Aurora Forecast #1 (Hobart) Aurora Forecast #2 (Hobart) Aurora Forecast #3 (Hobart)
User Magnetometer ID's: Learn more
If you have a TAFS Magnetometer and you want to add it to the graph you can do it here.
Insent your Mag's Unique ID.

v4.16b

Aurora Forecast is free to use, however it takes a lot of time and effort to maintain. If you find it useful and are a regular user then please consider making a donation to keep it running. Feedback is always welcome.

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

Aurora Forecast is free to use, however it takes a lot of time and effort to maintain.
Why not make a donation to keep it running?
Feedback is always welcome. - ©2022 Brendan Davey

GRAPH OPTIONS: Learn more It is recommended that you start out with the default options. As you get used to AF you can disable additional information and combine data series' together to maxamise the use of screen space.

DATA SOURCES: Learn more Some data sources can only be enabled or disabled via the tick box. Others are disabled using the slider set to 0, or enabled by setting the slider from 0.5 to 4. This number also represents the thinkness of the line plot onto the graph.

GRAPH OPTIONS: Learn more
It is recommended that you start out with the default options. As you get used to AF you can disable additional information and combine data series' together to maxamise the use of screen space.

DATA SOURCES: Learn more
Some data sources can only be enabled or disabled via the tick box. Others are disabled using the slider set to 0, or enabled by setting the slider from 0.5 to 4. This number also represents the thinkness of the line plot onto the graph.