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 Jun 02 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 8 (NOAA Scale
G4).
The greatest expected 3 hr Kp for Jun 02-Jun 04 2025 is 6.67 (NOAA Scale
G3).

NOAA Kp index breakdown Jun 02-Jun 04 2025

             Jun 02       Jun 03       Jun 04
00-03UT       4.67 (G1)    4.33         4.00     
03-06UT       5.00 (G1)    5.67 (G2)    4.00     
06-09UT       6.33 (G2)    4.67 (G1)    3.33     
09-12UT       6.67 (G3)    4.67 (G1)    3.00     
12-15UT       5.00 (G1)    4.67 (G1)    3.00     
15-18UT       4.67 (G1)    4.33         3.33     
18-21UT       6.67 (G3)    4.00         3.00     
21-00UT       4.67 (G1)    4.00         2.67     

Rationale: G1-G3 (Minor-Strong) geomagnetic storms are expected on 02
Jun due to CME effects. G1-G2 (Minor-Moderate) are likely on 03 Jun in
response to coronal hole effects.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was
above S-scale storm level thresholds.

Solar Radiation Storm Forecast for Jun 02-Jun 04 2025

              Jun 02  Jun 03  Jun 04
S1 or greater   99%     40%     25%

Rationale: The probability of S1 (Minor) solar radiation storms are
expects decline over 02-04 Jun.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Jun 02 2025 1118 UTC.

Radio Blackout Forecast for Jun 02-Jun 04 2025

              Jun 02        Jun 03        Jun 04
R1-R2           65%           55%           55%
R3 or greater   15%           15%           15%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a
slight chance of R3 (Strong), over 02-04 Jun.