***********************************************************************
Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 December 02 08:56UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************

I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 01.12.2025 at 23:00 UTC was 196 sfu.
The background X-Ray flux is at the class C3.0 level.
AR4299 erupted on December 01 at 02:49 UT peak time producing a X1.9-class solar flare and a radio blackout of category R3.
No obviously Earth directed CMEs were observed in available LASCO imagery on November 29-30.
An equatorial coronal hole (CH1333) will be Earth facing on November 30 - December 03

II. Solar Energetic Particle Events
Protons fluxes are quiet.
The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels.

III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 511 Km/s on December 01 at 10:30 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 -4 nT on December 01 at 09:45 UT during the last 24 hours.
The geomagnetic field was at quiet to active 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 02, at quiet to active levels on December 03 and at quiet to minor storm (G1) levels on December 04 due to the effect of the recurrent coronal hole high speed stream.

DateAp index forecastGeomagnetic Activity level
02.12.202508Quiet to Unsettled
03.12.202520Quiet to Active
04.12.202530Quiet to Minor Storm (G1)

***************************************************************************
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
***************************************************************************