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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 July 18 05:39UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 17.07.2025 at 23:00 UTC was 156 sfu.
The background X-Ray flux is at the class C1.2 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on July 14-16.
An equatorial coronal hole (CH1306) was Earth facing on July 08-15.

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

III. Interplanetary and Geomagnetic conditions
The solar wind speed measured by ACE satellite reached the max value 773 Km/s on July 17 at 14:55 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 -6 nT on July 17 at 15:55 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 quiet levels with Kp=2.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels on July 18-20.

DateAp index forecastGeomagnetic Activity level
18.07.202512Quiet to Unsettled
19.07.202510Quiet to Unsettled
20.07.202508Quiet 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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