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 Sep 18 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 Sep 18-Sep 20 2025 is 3.00 (below NOAA
Scale levels).

NOAA Kp index breakdown Sep 18-Sep 20 2025

             Sep 18       Sep 19       Sep 20
00-03UT       2.33         1.67         1.67     
03-06UT       3.00         1.33         1.33     
06-09UT       3.00         1.33         1.33     
09-12UT       2.33         1.33         1.33     
12-15UT       1.67         1.33         1.33     
15-18UT       1.67         1.33         1.33     
18-21UT       2.00         1.67         1.67     
21-00UT       2.33         1.67         1.67     

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 Sep 18-Sep 20 2025

              Sep 18  Sep 19  Sep 20
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 Sep 18-Sep 20 2025

              Sep 18        Sep 19        Sep 20
R1-R2           35%           35%           35%
R3 or greater    1%            1%            1%

Rationale: There remains a chance for isolated R1-R2 (Minor-Moderate)
radio blackouts through 20 Sep.