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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 August 28 07:21UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 27.08.2026 at 23:00 UTC was 122 sfu.
The background X-Ray flux is at the class B4.3 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on August 24 and 26.
A coronal hole (CH1395) at southern hemisphere was Earth facing on August 24-25.
---CME arrival forecast
A CME was observed on August 25 at 10:38 UT. This CME is expected to reach Earth between on August 28 at 14:44 UT and on August 29 at 05:44 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 395 Km/s on August 28 at 02:33 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 -4.26 nT on August 28 at 07:02 UT 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 minor storm (G1) levels on August 28-29 due to effects associated with CH1395 and the CME and at quiet to unsettled levels on August 30.

Date	Ap index forecast	Geomagnetic Activity level
28.08.2026	25	Quiet to Minor Storm (G1)
29.08.2026	15	Quiet to Minor Storm (G1)
30.08.2026	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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