Space Weather Report
Space Weather Report
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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 September 19 04:04UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 18.09.2025 at 23:00 UTC was 150 sfu.
The background X-Ray flux is at the class C1.1 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on September 15-17.
A coronal hole (CH1317) at northern hemisphere will become Earth facing on September 19-20.
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 559 Km/s on September 18 at 06:10 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 18 at 09:55UT during the last 24 hours.
The geomagnetic field was at quiet levels during the last 24 hours.
The Kp index now is at quiet levels with Kp=1.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on September 19-21.
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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 September 19 04:04UTC
Prepared by the Athens Space Weather Forecasting Center
***********************************************************************
I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 18.09.2025 at 23:00 UTC was 150 sfu.
The background X-Ray flux is at the class C1.1 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on September 15-17.
A coronal hole (CH1317) at northern hemisphere will become Earth facing on September 19-20.
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 559 Km/s on September 18 at 06:10 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 18 at 09:55UT during the last 24 hours.
The geomagnetic field was at quiet levels during the last 24 hours.
The Kp index now is at quiet levels with Kp=1.
IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on September 19-21.
| Date | Ap index forecast | Geomagnetic Activity level |
|---|---|---|
| 19.09.2025 | 06 | Quiet to Unsettled |
| 20.09.2025 | 06 | Quiet to Unsettled |
| 21.09.2025 | 08 | Quiet 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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