Solar Information
Solar images from SOHO
The Sun Now
Extreme ultraviolet Imaging Telescope image at 284 Angstrom (to 2 million degrees K)
Michelson Doppler Imager (MDI) image showing sunspots
Magnetogram image showing magnetic field, black and white show opposite polarities
Information from the Space Weather Prediction Center, Boulder, CO
National Oceanic and Atmospheric Administration (NOAA)
Aurora Activity
Solar Cycle
Sun Spot Number Progression
Last 5 cycles Sun Spot Number Progression
Solar Wind
3-day Solar-Geophysical Forecast
:Product: 3-Day Forecast
:Issued: 2026 Apr 24 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
A. NOAA 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 24-Apr 26 2026 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown Apr 24-Apr 26 2026
Apr 24 Apr 25 Apr 26
00-03UT 2.33 3.00 3.67
03-06UT 2.67 2.67 3.33
06-09UT 2.67 2.33 3.00
09-12UT 1.67 2.00 2.33
12-15UT 1.33 2.00 3.67
15-18UT 2.00 2.33 4.67 (G1)
18-21UT 2.00 3.33 4.33
21-00UT 2.33 3.67 3.33
Rationale: G1 (Minor) geomagnetic storms are likely on 26 Apr due to
anticipated influence from a CME that left the Sun on 23 Apr.
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 24-Apr 26 2026
Apr 24 Apr 25 Apr 26
S1 or greater 10% 10% 10%
Rationale: There exists a slight chance for S1 (Minor) or greater solar
radiation storms over 24-26 Apr.
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 23 2026 1708 UTC.
Radio Blackout Forecast for Apr 24-Apr 26 2026
Apr 24 Apr 25 Apr 26
R1-R2 55% 60% 60%
R3 or greater 10% 15% 15%
Rationale: R1-R2 (Minor-Moderate) radio blackouts remain likely, with a
slight chance for R3 (Strong), over 24-26 Apr.
