Last saved by: Maria Livada

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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 June 01 05:14UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 31.05.2026 at 23:00 UTC was 136 sfu.
The background X-Ray flux is at the class B7.4 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on May 28-30.
A coronal hole (CH1371) at northern hemisphere rotated across the central meridian on May 26-28.
An equatorial coronal hole (CH1372) will be Earth facing on May 31-June 01.

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 536 Km/s on May 31 at 05:20 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 -2 nT on May 31 at 13:20 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 June 01-02 and at quiet to active levels on June 03 due to the effect of recurrent coronal hole high speed streams.

Date | Ap index forecast | Geomagnetic Activity level
01.06.2026 | 08 | Quiet to Active
02.06.2026 | 08 | Quiet to Unsettled
03.06.2026 | 14 | 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
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