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 May 09 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 09-May 11 2025 is 4.67 (NOAA Scale
G1).
NOAA Kp index breakdown May 09-May 11 2025
May 09 May 10 May 11
00-03UT 3.33 3.67 3.00
03-06UT 3.67 3.00 3.67
06-09UT 3.67 2.67 2.67
09-12UT 3.67 2.00 2.00
12-15UT 3.67 2.67 2.00
15-18UT 4.00 2.00 2.67
18-21UT 4.67 (G1) 2.67 2.67
21-00UT 4.00 2.67 2.67
Rationale: G1 (Minor) conditions are likely on 09 May due to the onset
of another negative polarity CH HSS coupled with a possible glancing
blow CME from 05 May.
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 May 09-May 11 2025
May 09 May 10 May 11
S1 or greater 5% 5% 5%
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 May 09-May 11 2025
May 09 May 10 May 11
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
over 09-11 May.
