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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 March 25 11:50UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 24.03.2026 at 23:00 UTC was 128 sfu.
The background X-Ray flux is at the class C1.1 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on March 23-24.
An equatorial coronal hole (CH1351) was Earth facing on March 19-22.
A coronal hole (CH1352) at northern hemisphere will likely rotate across the central meridian on March 25-26.
---CME arrival forecast
A CME was observed on March 22 at at 16:23 UT. This CME is expected to reach Earth on March 25 between at 03:52 UT and at 10:56 UT according to EAM predictions.

II. Solar Energetic Particle Events
Protons fluxes are quiet.
The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm level on March 24.

III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 612 Km/s on March 24 at 13:30 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 -6 nT on March 25 at 08:50 UT during the last 24 hours.
The geomagnetic field was at quiet to minor storm (G1) levels during the last 24 hours.
The Kp index now is at minor storm (G1) levels with Kp=5.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on March 25 due to the effects of the recurrent coronal hole high speed stream and the CME and at quiet to unsettled levels on March 26-27.

Date	Ap index forecast	Geomagnetic Activity level
25.03.2026	15	Quiet to Active
26.03.2026	10	Quiet to Unsettled
27.03.2026	08	Quiet to Unsettled

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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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