Space Weather Report

Athens Cosmic Ray Station
Product: Daily Forecast of Geomagnetic Activity
Issued: 2023 March 24 09:18UTC
Prepared by the Athens Space Weather Forecasting Center

1. Solar activity
Solar activity was increasing during the past 24 hours.
Solar Flux (10.7 cm) measured on 23.03.2023 at 20:00 UTC was 151 sfu.
The background X-Ray flux is at the class B7.3 level.
The geomagnetic field was at quiet to strong storm (G3) levels on March 23.
A wide CME was observed to the NE in SOHO and STEREO A coronagraphs on March 20. The eruption is characterized by an erupting sigmoid/S-shaped structure centered around N27E20. This CME could reach Earth according to EAM predictions on March 23 between at 06:29 UT and 10:35 UT.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at strong storm (G3) levels with Kp=7.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 406 km/s.
Solar Wind speed from STEREO A: 400 km/s.
Solar Wind speed from STEREO B: - km/s.
The southward component Bz is: 4 nT south.

3. Solar Energetic Particle Events
Protons and electrons are quiet.

4. Coronal Holes
A large coronal hole (CH1136) at southern hemisphere was Earth facing on March 20-22.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at unsettled to strong storm (G3) levels on March 24 and at unsettled to minor storm (G1) levels on March 25-26 due to effects from CH1136 and CME observed on March 20.

Date Estimated Ap index Expected geom. storm
2023.03.24 45 G3
2023.03.25 30 G1
2023.03.26 15 G1

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