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Space Weather Observations, Alerts, and Forecast
Forecast text
Product: 3-Day Forecast
- Issued: 2026 Apr 01 0030 UTC
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center.
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 Apr 01-Apr 03 2026 is 6.33 (NOAA Scale
G2).
NOAA Kp index breakdown Apr 01-Apr 03 2026
| Apr 01 | Apr 02 | Apr 03 | |
|---|---|---|---|
| 00-03UT | 3.00 | 4.33 | 3.67 |
| 03-06UT | 5.67 (G2) | 4.00 | 3.33 |
| 06-09UT | 6.33 (G2) | 3.33 | 3.00 |
| 09-12UT | 4.67 (G1) | 2.33 | 3.00 |
| 12-15UT | 4.33 | 3.00 | 3.00 |
| 15-18UT | 4.00 | 4.67 (G1) | 3.00 |
| 18-21UT | 4.67 (G1) | 4.33 | 3.33 |
| 21-00UT | 3.67 | 4.67 (G1) | 3.67 |
Rationale: G2 (Moderate) geomagnetic storming levels are likely with a chance for isolated G3 (Strong) storm levels possible 01 Apr due to effects from the CME associated with 30 Mar X1.4 major flare event. Active to G1 (Minor) levels are anticipated to continue into 02 Apr as CME effects wane alongside the forecasted onset of CH HSS activity which is likely to cause unsettled to active levels on 03 Apr.
Solar Radiation Activity Observation
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 01-Apr 03 2026
| Apr 01 | Apr 02 | Apr 03 | |
|---|---|---|---|
| S1 or greater | 15% | 15% | 15% |
Rationale: There is a slight chance for the greater than 10 MeV proton flux to exceed S1 (Minor) solar radiation storm levels through 03 Apr due to the X1.4 flare at 30/0319 UTC and anticipated arrival of its associated CME alongside the complexity and evolution of the active regions currently on the solar disk.
Radio Blackout Activity
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Apr 01-Apr 03 2026
| Apr 01 | Apr 02 | Apr 03 | |
|---|---|---|---|
| R1-R2 | 55% | 55% | 55% |
| R3 or greater | 20% | 20% | 20% |
Rationale: Solar activity is likely to reach Minor-Moderate (R1-R2) levels, with a slight chance for X-class flares (R3/Strong) through 03 Apr due to the complexity and evolution of the active regions currently on the solar disk.
Sun Images
| eit 171 | eit 195 | eit 284 | eit 304 |
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Images: From left to right: EIT 171, EIT 195, EIT 284, EIT 304 EIT (Extreme ultraviolet Imaging Telescope) images the solar atmosphere at several wavelengths, and therefore, shows solar material at different temperatures. In the images taken at 304 Angstrom the bright material is at 60,000 to 80,000 degrees Kelvin. In those taken at 171 Angstrom, at 1 million degrees. 195 Angstrom images correspond to about 1.5 million Kelvin, 284 Angstrom to 2 million degrees. The hotter the temperature, the higher you look in the solar atmosphere. | |||
| SDO/HMI Continuum |
SDO/HMI Magnetogram |
LASCO C2 | LASCO C3 |
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The MDI (Michelson Doppler Imager) images shown here are taken in the continuum near the Ni I 6768 Angstrom line.
The most prominent features are the sun spots. |
LASCO (Large Angle Spectrometric Coronagraph) is able to take images of the solar corona by blocking the light coming directly from the Sun with an occulter disk, creating an artificial eclipse within the instrument itself. |
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 for more information | |||
Bigger versions of this page in a new window: New regular size page, New 1280×1024 window, and New 1600×1200 window. |
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Solar cycle
| Sunspot numbers | F10.7CM Radio flux | AP |
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| for more information | ||
The Solar Cycle is observed by counting the frequency and placement of sunspots visible on the Sun. Solar minimum occurred in December, 2008. Solar maximum in May, 2013. | ||
| Solar wind | Satellite impact | Xray flux |
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| for more information | for more information | for more information |
On the left: Real-Time Solar Wind data broadcast from NASA's ACE satellite. Middle: The Satellite Environment Plot combines satellite and ground-based data to provide an overview of the current geosynchronous satellite environment. Right: 3-days of 5-minute solar x-ray flux values measured on the SWPC primary and secondary GOES satellites. | ||
Auroral activity
| Northern Auroral map | Southern Auroral map |
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Alerts
Introduction Movie
Conditions on the Sun and in the solar wind, magnetosphere, ionosphere and thermosphere that can influence the performance and reliability of space-borne and ground-based technological systems and can endanger human life or health. This introduction movie in the English language will open on a new tab/window when you click on the image below.
Also in Quicktime format: Large (269M) and Small ( 60M).
links
Space Weather links:
Losts of interesting information3-Day Forecast of Solar and Geophysical Activity
Space Weather overview
LASCO Coronagraph
Solar wind
Forecast discussion
Solar and Heliospheric Observatory (SOHO)
The Very Latest SOHO Images
Space Agencies:
European Space Agency (ESA)
Institute of Space and Astronautical Science (ISAS)
National Aeronautics and Space Administration (NASA)
Russian Space Agency
Credits:
Space Weather Images and Information (excluded from copyright) courtesy of:
NOAA / NWS Space Weather Prediction Center,
Mauna Loa Solar Observatory (HAO/NCAR),
and SOHO (ESA & NASA).
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