Space Weather Report


Product: Daily Forecast of Geomagnetic Activity

Issued: 2021 January 17 07:08UTC

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 16.01.2021 at 20:00 UTC was 78 sfu.

The background X-Ray flux is at the class A4.8 level.

The geomagnetic field was at very quiet levels on January 16.

No obviously Earth directed CMEs were observed in available LASCO imagery.

The Kp index now is at almost quiet levels with Kp=2.


2. Solar Wind Geomagnetic Activity

Solar Wind speed from ACE: 290 km/s.

Solar Wind speed from STEREO A: 340 km/s.

Solar Wind speed from STEREO B: --- km/s.

The southward component Bz is: 1 nT south.


3. Solar Energetic Particle Events

Protons and electrons are quiet.


4. Coronal Holes

A large south polar coronal hole was in Earth facing position. A new coronal hole (CH988) on the northern hemisphere will be in Earth facing position on Jan.  15-17.


5. Geophysical Activity Forecast

The geomagnetic field is expected to be at very quiet levels on Jan. 17 and at quiet to active levels on Jan. 18-19 due to effects by the southern polar CH.


   Date      Estimated Ap index      Expected geom. storm

2021.01.17           04                        -

2021.01.18           08                        -

2021.01.19           12                        -



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