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 Aug 16 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 Aug 16-Aug 18 2025 is 3.67 (below NOAA
Scale levels).
NOAA Kp index breakdown Aug 16-Aug 18 2025
Aug 16 Aug 17 Aug 18
00-03UT 1.67 1.67 3.33
03-06UT 1.67 1.67 3.00
06-09UT 1.33 1.33 3.00
09-12UT 1.33 1.33 3.00
12-15UT 1.33 1.33 3.00
15-18UT 1.33 1.33 3.33
18-21UT 1.33 1.33 3.67
21-00UT 1.67 1.67 3.67
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 Aug 16-Aug 18 2025
Aug 16 Aug 17 Aug 18
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 Aug 16-Aug 18 2025
Aug 16 Aug 17 Aug 18
R1-R2 30% 30% 30%
R3 or greater 5% 5% 5%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 16-18 Aug.
