Space Weather Report
Space Weather Report
***********************************************************************
Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 September 17 04:05UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************
I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 16.09.2025 at 23:00 UTC was 135 sfu.
The background X-Ray flux is at the class B9.3 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on September 13-15.
A large equatorial coronal hole (CH1316) rotated across the central meridian on September 10-13.
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 772 Km/s on September 16 at 11:10 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 -3 nT on September 16 at 16:20 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 unsettled levels on September 17-18 and at quiet levels on September 19.
***************************************************************************
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
***************************************************************************
Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 September 17 04:05UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************
I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 16.09.2025 at 23:00 UTC was 135 sfu.
The background X-Ray flux is at the class B9.3 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on September 13-15.
A large equatorial coronal hole (CH1316) rotated across the central meridian on September 10-13.
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 772 Km/s on September 16 at 11:10 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 -3 nT on September 16 at 16:20 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 unsettled levels on September 17-18 and at quiet levels on September 19.
| Date | Ap index forecast | Geomagnetic Activity level |
|---|---|---|
| 17.09.2025 | 12 | Quiet to Unsettled |
| 18.09.2025 | 08 | Quiet to Unsettled |
| 19.09.2025 | 08 | Quiet |
***************************************************************************
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
***************************************************************************