IAASARS, National Observatory of Athens, Athens, Greece; Department of Physics, Faculty of Astrophysics and Space Physics, University of Crete, Heraklion, Greece
IAASARS, National Observatory of Athens, Athens, Greece
University of Hertfordshire, Hatfield, United Kingdom
Electrical and Electronics Engineering Department, University of West Attica, Athens, Greece
IAASARS, National Observatory of Athens, Athens, Greece