Aurora Forecast

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27 Day

Alerts:
none

Solar-terrestrial indices for 25 April follow.
Solar flux 164 and estimated planetary A-index 5.
The estimated planetary K-index at 0300 UTC on 26 April was 2.00.

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 24 Apr 013
Estimated Ap 25 Apr 005
Predicted Ap 26 Apr-28 Apr 008-015-012

NOAA Geomagnetic Activity Probabilities 26 Apr-28 Apr
Active                20/35/35
Minor storm           05/25/20
Moderate storm        01/05/05
Strong-Extreme storm  01/01/01

NOAA Kp index forecast 26 Apr - 28 Apr
             Apr 26    Apr 27    Apr 28
00-03UT        2.33      3.33      3.00
03-06UT        2.00      2.00      2.00
06-09UT        2.33      2.00      2.00
09-12UT        2.00      3.00      2.67
12-15UT        2.00      3.00      2.67
15-18UT        2.00      4.00      2.67
18-21UT        2.00      3.33      2.67
21-00UT        2.00      3.00      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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 26-Apr 28 2025 is 4.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 26-Apr 28 2025

             Apr 26       Apr 27       Apr 28
00-03UT       2.33         3.33         3.00
03-06UT       2.00         2.00         2.00
06-09UT       2.33         2.00         2.00
09-12UT       2.00         3.00         2.67
12-15UT       2.00         3.00         2.67
15-18UT       2.00         4.00         2.67
18-21UT       2.00         3.33         2.67
21-00UT       2.00         3.00         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-18 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Apr 26-Apr 28 2025

              Apr 26  Apr 27  Apr 28
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 Apr 26-Apr 28 2025

              Apr 26        Apr 27        Apr 28
R1-R2           40%           40%           40%
R3 or greater    1%            1%            1%

Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 26-28 Apr.

Extended Space Weather Discussion:

Solar Activity

.24 hr Summary...
Solar activity remained at low levels. Region 4077 (S17E62, Dao/beta)
produced the largest event of the period, a C3.0 flare at 25/0405 UTC.
Regions 4064 (N11W45, Dki/beta) and 4070 (S12W01, Dai/beta) were the
largest on the disk but remained mostly quiet over the past 24 hours.
Only minor changes were observed in the 15 numbered regions with
sunspots on the visible disk.

No Earth-directed CMEs were observed in available coronagraph imagery.

.Forecast...
Solar activity is expected to be moderate with a chance of M-class
flares (R1-R2, Minor-Moderate) over 26-28 Apr.

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at moderate levels and the
greater than 10 MeV proton flux was at background levels.

.Forecast...
The greater than 2 MeV electron flux is likely to be at normal to
moderate levels over 26-28 Apr. The greater than 10 MeV proton flux is
expected to continue at background levels.

Solar Wind

.24 hr Summary...
Solar wind parameters reflected the continued but waning influence of a
positive polarity CH HSS. Total magnetic field strength was between 5-7
nT. No significant periods of southward Bz were observed. Solar wind
speeds gradually declined from ~500 km/s to ~450 km/s by the end of the
reporting period. Phi angle was predominantly positive.

.Forecast...
Solar wind parameters are expected to continue to be influenced by
positive polarity, CH HSS conditions through 28 Apr.

Geospace

.24 hr Summary...
The geomagnetic field has been at quiet levels.

.Forecast...
The geomagnetic field is expected to remain at mostly quiet to unsettled
levels, with isolated active conditions likely on 26 and 28 Apr, due to
influence from multiple positive polarity CH HSSs.

27 Day Forecast:

Date | Radio Flux | Planetary A Index | Largest Kp Index
2025 Apr 21     160          12          4
2025 Apr 22     165          35          6
2025 Apr 23     165          35          6
2025 Apr 24     165          25          5
2025 Apr 25     165          18          5
2025 Apr 26     165           8          3
2025 Apr 27     165           8          3
2025 Apr 28     170           6          2
2025 Apr 29     170           6          2
2025 Apr 30     170           6          2
2025 May 01     170          25          5
2025 May 02     175          35          6
2025 May 03     170          20          4
2025 May 04     165          12          4
2025 May 05     165          25          5
2025 May 06     165          20          5
2025 May 07     160          18          5
2025 May 08     165          18          5
2025 May 09     165          18          5
2025 May 10     165          15          5
2025 May 11     160          18          5
2025 May 12     155           5          2
2025 May 13     155           5          2
2025 May 14     155           5          2
2025 May 15     155           5          2
2025 May 16     155          12          4
2025 May 17     155          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.