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Product: Daily Forecast of Geomagnetic Activity
Issued: 2025 August 19 05:48UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 18.08.2025 at 23:00 UTC was 114 sfu.
The background X-Ray flux is at the class C4.0 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on August 15-16.
An equatorial coronal hole (CH1312) rotated across the central meridian on August 15-18.

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 399 Km/s on August 19 at 01:20 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 -7 nT on August 18 at 10:25 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 minor storm (G1) levels on August 19-20 due to effects of a coronal hole high speed wind stream and at quiet to active levels on August 21.

Date	Ap index forecast	Geomagnetic Activity level
19.08.2025	30	Quiet to Minor storm (G1)
20.08.2025	20	Quiet to Minor storm (G1)
21.08.2025	12	Quiet to Active

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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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