Space Weather Report
Space Weather Report
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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 January 18 07:06UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 17.01.2026 at 23:00 UTC was 159 sfu.
The background X-Ray flux is at the class C3.0 level.
Two M-class flares were produced on January 17 and the biggest was the M2.2.
AR4341 erupted on January 17 at 10:29 UT peak time producing an M2.2-class solar flare and a radio blackout of category R1.
No obviously Earth directed CMEs were observed in available LASCO imagery on January 14-16.
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 reavhrd at minor storm levels.
III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 732 Km/s on January 17 at 10:50 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 17 at 16:40 UT during the last 24 hours.
The geomagnetic field was at unsettled to minor storm (G1) levels during the last 24 hours.
The Kp index now is at active levels with Kp=4.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm (G1) levels on January 18-20 due to the effects of the recurrent coronal hole high speed stream.
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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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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 January 18 07:06UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************
I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 17.01.2026 at 23:00 UTC was 159 sfu.
The background X-Ray flux is at the class C3.0 level.
Two M-class flares were produced on January 17 and the biggest was the M2.2.
AR4341 erupted on January 17 at 10:29 UT peak time producing an M2.2-class solar flare and a radio blackout of category R1.
No obviously Earth directed CMEs were observed in available LASCO imagery on January 14-16.
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 reavhrd at minor storm levels.
III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 732 Km/s on January 17 at 10:50 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 17 at 16:40 UT during the last 24 hours.
The geomagnetic field was at unsettled to minor storm (G1) levels during the last 24 hours.
The Kp index now is at active levels with Kp=4.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm (G1) levels on January 18-20 due to the effects of the recurrent coronal hole high speed stream.
| Date | Ap index forecast | Geomagnetic Activity level |
|---|---|---|
| 18.01.2026 | 25 | Quiet to Minor Storm (G1) |
| 19.01.2026 | 22 | Quiet to Minor Storm (G1) |
| 20.01.2026 | 15 | 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
URL: http://spaceweather.phys.uoa.gr
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