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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 January 04 08:13UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 03.01.2026 at 23:00 UTC was 165 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 January 02-03.
A northern hemisphere coronal hole (CH1337) rotated across the central meridian on December 28-30.
A CME was observed on December 31 at 14:00 UT. This CME is expected to reach Earth between on January 02 at 20:26 UT and on January 03 at 06:30 UT according to EAM prediction.
A CME was observed on January 01 at 19:36 UT. This CME is expected to reach Earth on January 04 between at 17:24 UT and at 18:58 UT according to EAM prediction.

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

III. Interplanetary and Geomagnetic condition
The solar wind speed measured by ACE satellite reached the max value 551 Km/s on January 03 at 12:55 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 -7 nT on January 03 at 15:55 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 quiet levels with Kp=1.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on January 04 due to effects associated with CMEs and at quiet to unsettled levels on January 05-06.

Date	Ap index forecast	Geomagnetic Activity level	
04.01.2026	15	Quiet to Active	
05.01.2026	08	Quiet to Unsettled	
06.01.2026	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
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