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Product: Daily Forecast of Geomagnetic Activity
Issued: 2021 March 13 06:49UTC
Prepared by the Athens Space Weather Forecasting Center
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1. Solar activity
Solar activity was increasing during the past 24 hours.
Solar Flux (10.7 cm) measured on 12.03.2021 at 20:00 UTC was 77 sfu.
The background X-Ray flux is at the class A2.8 level.
The geomagnetic field was at almost quiet to unsettled levels on March 12.
No obviously Earth directed CMEs were observed in available LASCO imagery.
The Kp index now is at active levels with Kp=4.

2. Solar Wind Geomagnetic Activity
Solar Wind speed from ACE: 385 km/s.
Solar Wind speed from STEREO A: 345 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 6 nT south.

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

4. Coronal Holes
A new coronal hole (CH998) on the southern hemisphere of the visible solar disk was in Earth facing position on Mar. 9-11.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at almost quiet to active levels with a chance for minor storm intervals on Mar. 13, at almost quiet to unsettled levels on Mar. 14 due to CH998 effects and at quiet levels on Mar. 15.

   Date      Estimated Ap index      Expected geom. storm
2021.03.13           20                        G1
2021.03.14           12                        -
2021.03.15           04                        -

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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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