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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 January 16 09:09UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 15.01.2026 at 23:00 UTC was 139 sfu.
The background X-Ray flux is at the class C1.0 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on January 13-15.
An equatorial coronal hole (CH1340) will become Earth facing on January 15-18.

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 716 Km/s on January 16 at 05:15 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 -10 nT on January 16 at 03:30 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 unsettled levels with Kp=3.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on January 16 and at quiet to minor storm (G1) levels on January 17-18 due to the effects of the recurrent coronal hole high speed stream.

Date	Ap index forecast	Geomagnetic Activity level	
16.01.2026	15	Quiet to Active	
17.01.2026	25	Quiet to Minor Storm (G1)	
18.01.2026	20	Quiet 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
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