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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 December 27 07:29UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 26.12.2025 at 23:00 UTC was 166 sfu.
The background X-Ray flux is at the class C1.6 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on December 24-26.
An equatorial coronal hole (CH1336) will be Earth facing on December 19-27.

II. Solar Energetic Particle Events
Protons fluxes are quiet.
The greater than 2 MeV electron flux at geosynchronous orbit mainted at minor storm levels on December 27.

III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 554 Km/s on December 26 at 10:15 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 -4 nT on December 26 at 14:35 UT during the last 24 hours.
The geomagnetic field was at quiet to unsettled levels during the last 24 hours.
The Kp index now is at unsettled levels with Kp=3.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet levels on December 27-29.

DateAp index forecastGeomagnetic Activity level
27.12.202505Quiet
28.12.202505Quiet
29.12.202505Quiet

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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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