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Product: Daily Forecast of Geomagnetic Activity
Issued: 2024 December 21 08:11UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 20.12.2024 at 23:00 UTC was 175 sfu.
The background X-Ray flux is at the class C2.7 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on December 18.
A coronal hole (CH1263) at southern hemisphere rotated across the central meridian on December 19-20.

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 541 Km/s on December 20 at 12:05 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 -8 nT on December 20 at 15:15 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 December 21-23.

DateAp index forecastGeomagnetic Activity level
21.12.202408Quiet to Unsettled
22.12.202408Quiet to Unsettled
23.12.202410Quiet 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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