***********************************************************************
Product: Daily Forecast of Geomagnetic Activity
Issued: 2018 August 16 06:11UTC
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 15.08.2018 at 20:00 UTC was 69 sfu.
The background X-Ray flux is at the class A2 level.
The geomagnetic field was at very quiet to active levels on August 15.
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: 500 km/s.
Solar Wind speed from STEREO A: 420 km/s.
Solar Wind speed from STEREO B: --- km/s.
The southward component Bz is: 4 nT north.

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

4. Coronal Holes
A coronal hole (CH880) which is an extension of the northern polar coronal hole was in Earth facing position on August 11-12. A high speed stream of solar wind from CH880 reached Earth on the first half of August 15. A new coronal hole (CH881) is expected to be in Earth facing position on August 17-18.

5. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on August 16 due to CH880 effects, at quiet to unsettled levels on August 17 and at quiet levels on August 18.

Date Estimated Ap index Expected geom. storm
2018.08.16 11 -
2018.08.17 07 -
2018.08.18 04 -

***************************************************************************
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
***************************************************************************