roduct: 3-Day Forecast
:Issued: 2026 Mar 23 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 7 (NOAA Scale
G3).
The greatest expected 3 hr Kp for Mar 23-Mar 25 2026 is 6.00 (NOAA Scale
G2).

NOAA Kp index breakdown Mar 23-Mar 25 2026

             Mar 23       Mar 24       Mar 25
00-03UT       6.00 (G2)    4.00         3.00     
03-06UT       5.67 (G2)    3.67         3.67     
06-09UT       4.67 (G1)    3.00         2.67     
09-12UT       4.00         2.33         2.67     
12-15UT       3.00         2.33         2.00     
15-18UT       3.00         2.33         2.00     
18-21UT       3.33         2.67         2.67     
21-00UT       3.67         3.00         2.67     

Rationale: Periods of G1-G2 (Minor-Moderate) geomagnetic storming are
expected on 23 Mar in response to negative polarity CH HSS influences.
Periods of active conditions are expected on 24-25 Mar as negative
polarity CH HSS influences continue, but gradually diminish.

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 Mar 23-Mar 25 2026

              Mar 23  Mar 24  Mar 25
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 Mar 23-Mar 25 2026

              Mar 23        Mar 24        Mar 25
R1-R2           25%           20%           20%
R3 or greater    5%            1%            1%

Rationale: Solar activity is expected to be low with a chance for
M-class flares on 23 Mar, and is likely to be low with a slight chance
for an M-class flare on 24-25 Mar.


--- MBSE BBS v1.1.7.2 (Linux-x86_64)
 * Origin: Outpost BBS * Johnson City, TN (618:618/1)