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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 May 14 03:11UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 13.05.2026 at 23:00 UTC was 103 sfu.
The background X-Ray flux is at the class B6.7 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on May 11-12.
A coronal hole (CH1365) at southern hemisphere rotated across the central meridian on May 09-10.
An equatorial coronal hole (CH1366) is expected to become Earth facing on May 12-15.

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 501 Km/s on May 13 at 17:15 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 -8 nT on May 13 at 12:45 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 active levels on May 14 and at quiet to minor storm (G1) levels on May 15-16 due to the effect of recurrent coronal hole high speed stream.

DateAp index forecastGeomagnetic Activity level
14.05.202612Quiet to Active
15.05.202628Quiet to Minor storm (G1)
16.05.202625Quiet to Minor storm (G1)

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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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