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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 June 19 05:09UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 18.06.2026 at 23:00 UTC was 111 sfu.
The background X-Ray flux is at the class B4.1 level.
No obviously Earth directed CMEs were observed in available LASCO imagery on June 15-17.
An equatorial coronal hole (CH1376) was Earth facing on June 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 428 Km/s on June 18 at 06:18 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 June 18 at 22:31 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 unsettled levels on June 19-21.

DateAp index forecastGeomagnetic Activity level
19.06.202610Quiet to Unsettled
20.06.202608Quiet to Unsettled
21.06.202608Quiet 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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