Space Weather Report
Space Weather Report
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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 December 13 06:41UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 12.12.2025 at 23:00 UTC was 135 sfu.
The background X-Ray flux is at the class B8.0 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on December 09-11.
A coronal hole (CH1334) at northern hemisphere will become Earth facing on December 10-15.
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 545 Km/s on December 13 at 06:00 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 -14 nT on December 12 at 20:45 UT during the last 24 hours.
The geomagnetic field was at quiet to minor storm (G1) levels during the last 24 hours.
The Kp index now is at quiet levels with Kp=2.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to active with a chance of minor storm (G1) levels on December 13-14 due to the effect of the recurrent coronal hole high speed stream and at quiet to unsettled levels on December 15.
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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: 2025 December 13 06:41UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************
I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 12.12.2025 at 23:00 UTC was 135 sfu.
The background X-Ray flux is at the class B8.0 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on December 09-11.
A coronal hole (CH1334) at northern hemisphere will become Earth facing on December 10-15.
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 545 Km/s on December 13 at 06:00 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 -14 nT on December 12 at 20:45 UT during the last 24 hours.
The geomagnetic field was at quiet to minor storm (G1) levels during the last 24 hours.
The Kp index now is at quiet levels with Kp=2.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to active with a chance of minor storm (G1) levels on December 13-14 due to the effect of the recurrent coronal hole high speed stream and at quiet to unsettled levels on December 15.
| Date | Ap index forecast | Geomagnetic Activity level |
|---|---|---|
| 13.12.2025 | 20 | Quiet to Active |
| 14.12.2025 | 12 | Quiet to Active |
| 15.12.2025 | 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
URL: http://spaceweather.phys.uoa.gr
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