Last saved by: Maria Livada

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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 July 27 21:02UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 26.07.2026 at 23:00 UTC was 147 sfu.
The background X-Ray flux is at the class C1.0 level.
One M3.2-class solar flare was produced on July 26.
No obviously Earth directed CMEs were observed in available LASCO imagery on July 25-26.
An equatorial coronal hole (CH1387) was Earth facing on July 20-21.
---CME arrival forecast
A CME was observed on July 24 at 04:38 UT. This CME is expected to reach Earth between on July 26 at 20:50 UT and on July 27 at 01:13 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 441 Km/s on July 27 at 05:13 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 -4.47 nT on July 27 at 06:37 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=2.

IV. 3-day Geomagnetic Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on July 27-28 and at quiet to unsettled levels on July 29.

Date | Ap index forecast | Geomagnetic Activity level
27.07.2026 | 18 | Quiet to Active
28.07.2026 | 15 | Quiet to Active
29.07.2026 | 12 | 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
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