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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 March 23 06:15UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was decreasing stable during the past 24 hours.
Solar Flux (10.7 cm) measured on 22.03.2021 at 20:00 UTC was 80 sfu.
The background X-Ray flux is at the class A7.1 level.
The geomagnetic field was at quiet to unsettled levels on March 21.
No obviously Earth directed CMEs were observed in available LASCO imagery for Mar. 21-23.
A partial halo CME observed on Mar. 20 at ~00:48 UT and is possible to reach Earth on Mar. 23 at ~13:53UT (EAMv2) or ~02:49UT (EAMv3).
The Kp index now is at active levels with Kp=4.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 525 km/s.
Solar Wind speed from STEREO A: 380 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 0 nT.

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

4. Coronal Holes
A new coronal hole on the southern hemisphere of the visible solar disk was in Earth facing position on Mar. 17-18.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on Mar. 22-24 with a chance for minor geomagnetic storm (G1) intervals due to combined CH1000 and CME arrival  effects.

   Date      Estimated Ap index      Expected geom. storm
2021.03.23           13                        -
2021.03.24           14                        -
2021.03.25           07                        -

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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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