Drought hotspots and recent changes in their characteristics across the African continent during the historical period (1928-2017)

Moustapha Tall1, Mouhamadou Bamba Sylla2, Alima Dajuma1 and Djan'na Koubodana Houteta1, (1)African Institute for Mathematical Sciences (AIMS), Kigali, Rwanda, (2)AIMS-Rwanda; African Institute for Mathematical Sciences of Rwanda, Kigali, Rwanda