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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 January 15 10:52UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 14.01.2026 at 23:00 UTC was 127 sfu.
The background X-Ray flux is at the class C1.3 level.
AR4341 erupted on January 14 at 20:33 UT peak time producing an M1.6-class solar flare and a radio blackout of category R1.
No obviously Earth directed CMEs were observed in available LASCO imagery on January 12-14.
An equatorial coronal hole (CH1340) will become Earth facing on January 15-18.

II. Solar Energetic Particle Events
Protons fluxes are quiet.
The greater than 2 MeV electron flux at geosynchronous orbit mainted minor storm levels on January 14.

III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 634 Km/s on January 15 at 09:45 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 -5 nT on January 14 at 07:15 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 to unsettled levels on January 15-16 and at quiet to minor storm (G1) levels on January 17 due to the effects of the recurrent coronal hole high speed stream.

Date	Ap index forecast	Geomagnetic Activity level	
15.01.2026	10	Quiet to Unsettled	
16.01.2026	08	Quiet to Unsettled	
17.01.2026	25	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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