Space Weather Report
Space Weather Report
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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 December 22 07:11UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 21.12.2025 at 23:00 UTC was 124 sfu.
The background X-Ray flux is at the class C1.4 level.
AR4316 erupted on December 21 at 18:27 UT peak time producing a M1.3-class solar flare and a radio blackout of category R1.
No obviously Earth directed CMEs were observed in available LASCO imagery on December 21.
An equatorial coronal hole (CH1336) will be Earth facing on December 19-22.
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 739 Km/s on December 22 at 04:55 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 -10 nT on December 21 at 13:50 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 unsettled levels with Kp=3.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm (G1) levels on December 22-23 due to the effect of the recurrent coronal hole high speed stream and at quiet to active levels on December 24.
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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 22 07:11UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************
I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 21.12.2025 at 23:00 UTC was 124 sfu.
The background X-Ray flux is at the class C1.4 level.
AR4316 erupted on December 21 at 18:27 UT peak time producing a M1.3-class solar flare and a radio blackout of category R1.
No obviously Earth directed CMEs were observed in available LASCO imagery on December 21.
An equatorial coronal hole (CH1336) will be Earth facing on December 19-22.
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 739 Km/s on December 22 at 04:55 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 -10 nT on December 21 at 13:50 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 unsettled levels with Kp=3.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm (G1) levels on December 22-23 due to the effect of the recurrent coronal hole high speed stream and at quiet to active levels on December 24.
| Date | Ap index forecast | Geomagnetic Activity level |
|---|---|---|
| 22.12.2025 | 25 | Quiet to Minor Storm (G1) |
| 23.12.2025 | 20 | Quiet to Minor Storm (G1) |
| 24.12.2025 | 18 | Quiet to Active |
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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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