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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 September 08 04:39UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 07.09.2025 at 23:00 UTC was 133 sfu.
The background X-Ray flux is at the class B7.8 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on September 05-06.
A coronal hole (CH1315) at southern hemisphere will rotate into an Earth facing position on September 02-07.
---CME arrival forecast
A CME was observed on September 04 at 20:30 UT. This CME was expected to reach Earth between on September 06 at 21:53 UT and on September 07 at 11:55 UT according to EAM predictions.

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 620 Km/s on September 07 at 22:40 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 September 08 at 00:00 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 September 08-10.

DateAp index forecastGeomagnetic Activity level
08.09.202510Quiet to Unsettled
09.09.202508Quiet to Unsettled
10.09.202508Quiet 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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