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Space Weather Observations, Alerts, and Forecast

Forecast text

Product: 3-Day Forecast - Issued: 2026 Aug 28 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 1 (below NOAA Scale levels).
The greatest expected 3 hr Kp for Aug 28-Aug 30 2026 is 5.67 (NOAA Scale G2).

NOAA Kp index breakdown Aug 28-Aug 30 2026

	Aug 28	Aug 29	Aug 30
00-03UT	2.33	5.67 (G2)	3.67
03-06UT	2.67	4.67 (G1)	3.33
06-09UT	4.00	4.00	3.00
09-12UT	4.00	3.00	3.00
12-15UT	4.67 (G1)	2.33	3.00
15-18UT	5.00 (G1)	2.67	2.00
18-21UT	4.67 (G1)	2.67	3.33
21-00UT	5.67 (G2)	3.00	3.33

Rationale: G1 (Minor) storm levels are likely due to the onset of positive polarity CH HSS effects. Later on 28 Aug, G2 (Moderate) storm levels are likely due to additional disturbances caused by the anticipated arrival of the CMEs that left the Sun on 25-26 Aug. G1 to G2 storm levels are likely to persist through 29 Aug before waning conditions are expected on 30 Aug.

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 Aug 28-Aug 30 2026

	Aug 28	Aug 29	Aug 30
S1 or greater	10%	10%	10%

Rationale: here is a slight chance for the greater than 10 MeV proton flux to reach S1 (Minor) storm levels through 30 Aug, mostly due to the potential for activity from Region 4513.

Radio Blackout Activity

No radio blackouts were observed over the past 24 hours.

Radio Blackout Forecast for Aug 28-Aug 30 2026

	Aug 28	Aug 29	Aug 30
R1-R2	45%	45%	45%
R3 or greater	10%	10%	10%

Rationale: There is a chance for isolated R1/R2 (Minor-Moderate) radio blackouts, with a slight chance for an isolated R3 (Strong) event through 30 Aug primarily due to the current potential and flare history of Region 4513.

Sun Images

eit 171	eit 195	eit 284	eit 304


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


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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Bigger versions of this page in a new window: New regular size page, New 1280×1024 window, and New 1600×1200 window.

Solar cycle

Sunspot numbers	F10.7CM Radio flux	AP


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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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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

Instruments on board the NOAA Polar-orbiting Operational Environmental Satellite (POES) continually monitor the power flux carried by the protons and electrons that produce aurora in the atmosphere. SWPC has developed a technique that uses the power flux observations obtained during a single pass of the satellite over a polar region (which takes about 25 minutes) to estimate the total power deposited in an entire polar region by these auroral particles. The power input estimate is converted to an auroral activity index that ranges from 1 to 10.

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 information
3-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).

Équipement que nous utilisons:

Station de Météo Davis VP2	Programme Météo Weather Display