1. Department
of Mathematics, Technion - IIT, Haifa, 3200003, Israel
2. Department
of Solar Energy and Environmental Physics, Swiss Institute for Dryland
Environmental and Energy Research, Blaustein Institutes for Desert
Research (BIDR), Ben-Gurion University of the Negev, Sede Boqer
Campus, Midreshet Ben-Gurion, 84990, Israel