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Product: Daily Forecast of Geomagnetic Activity
Issued: 2026 July 03 07:05UTC
Prepared by the Athens Space Weather Forecasting Center
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I. Solar activity
--Current Status
Solar Flux (10.7cm) measured on 02.07.2026 at 23:00 UTC was 203 sfu.
The background X-Ray flux is at the class C2.9 level.
Three M-class solar flares were produced on July 02.
No obviously Earth directed CMEs were observed in available LASCO imagery on June 28-29.
An extension of the southern polar coronal hole (CH1381) will be Earth facing on July 01-02.
---CME arrival forecast
A CME was observed on June 30 at 21:45 UT. The source is associated with an X1.1-class solar flare (N17W18) peaking on June 30 at 20:50 UT. This CME is expected to reach Earth on July 03 between at 00:44 UT and at 14:03 UT according to EAM predictions.
Another CME was observed on July 02 at 02:36 UT. This CME is expected to reach Earth on July 04 between at 10:51 UT and at 20:43 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 393 Km/s on July 03 at 00:13 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 -1.79 nT on July 02 at 14:56 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 moderate storm (G2) levels on July 03-04 due to the effects of the CMEs and at quiet to minor storm (G1) levels on July 05.

DateAp index forecastGeomagnetic Activity level
03.07.202635Quiet to Moderate Storm (G2)
04.07.202630Quiet to Moderate Storm (G2)
05.07.202618Quiet 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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