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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 March 13 08:22UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 12.03.2026 at 23:00 UTC was 121 sfu.
The background X-Ray flux is at the class C1.5 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on March 10-12.
An equatorial coronal hole (CH1349) will likely rotate across the central meridian on March 11-14.

II. Solar Energetic Particle Events
Protons and electrons fluxes are quiet.

III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 460 Km/s on March 12 at 13:50 UT during the last 24 hours.
The solar wind speed from STEREO A was detected 400 Km/s during the last 24 hours.
The vertical component of IMF Bz reached the max value -8 nT on March 13 at 08:05 UT during the last 24 hours.
The geomagnetic field was at quiet to active levels during the last 24 hours.
The Kp index now is at active levels with Kp=4.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm (G1) levels on March 13-15 due to effects from CH1349.

DateAp index forecastGeomagnetic Activity level
13.03.202620Quiet to Minor Storm (G1)
14.03.202625Quiet to Minor Storm (G1)
15.03.202615Quiet to Minor Storm (G1)

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Athens Space Weather Forecasting Center
Physics Department, National & Kapodistrian University of Athens
Athens Neutron Monitor Station A.NE.MO.S
Tel.: +30 210 727 6901
email: spaceweather@phys.uoa.gr
URL: http://spaceweather.phys.uoa.gr
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