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: 2024 Apr 23 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 23-Apr 25 2024 is 4.33 (below NOAA
Scale levels).

NOAA Kp index breakdown Apr 23-Apr 25 2024

             Apr 23       Apr 24       Apr 25
00-03UT       2.00         3.00         3.00     
03-06UT       1.00         2.67         2.67     
06-09UT       2.33         2.67         3.67     
09-12UT       2.00         2.00         4.33     
12-15UT       2.67         2.00         3.67     
15-18UT       2.67         1.67         3.33     
18-21UT       2.67         1.67         2.67     
21-00UT       3.00         2.67         4.00     

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 Apr 23-Apr 25 2024

              Apr 23  Apr 24  Apr 25
S1 or greater   20%     20%     20%

Rationale: There is a slight chance for S1 (Minor) solar radiation
storms over 23-25 Apr due to the flare potential of several regions on
the visible disk.

C. NOAA Radio Blackout Activity and Forecast

Radio blackouts reaching the R1 levels were observed over the past 24
hours. The largest was at Apr 23 2024 0319 UTC.

Radio Blackout Forecast for Apr 23-Apr 25 2024

              Apr 23        Apr 24        Apr 25
R1-R2           75%           75%           75%
R3 or greater   20%           20%           20%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with a
slight chance for R3 (Strong) or greater events, over 23-25 Apr.