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: 2025 Dec 10 1230 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 Dec 10-Dec 12 2025 is 4.67 (NOAA Scale
G1).

NOAA Kp index breakdown Dec 10-Dec 12 2025

             Dec 10       Dec 11       Dec 12
00-03UT       2.67         1.00         3.33     
03-06UT       2.00         2.00         2.00     
06-09UT       3.33         2.33         2.00     
09-12UT       2.00         2.33         3.00     
12-15UT       2.00         2.33         2.67     
15-18UT       2.00         2.33         3.00     
18-21UT       3.00         2.33         3.33     
21-00UT       4.67 (G1)    2.67         3.33     

Rationale: Isolated G1 (Minor) or greater geomagnetic storms are likely
on 10 Dec, due to passage of a magnetic transient.

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 Dec 10-Dec 12 2025

              Dec 10  Dec 11  Dec 12
S1 or greater   15%     15%      15%

Rationale: There is a slight chance for S1 (Minor) or greater solar
radiation storms on 10-12 Dec.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Dec 10 2025 0737 UTC.

Radio Blackout Forecast for Dec 10-Dec 12 2025

              Dec 10        Dec 11        Dec 12
R1-R2           75%           75%           65%
R3 or greater   15%           15%           15%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected on 10-11
Dec and likely on 12 Dec. There is a slight chance of R3 (Strong) or
greater events on 10-12 Dec.