AAVSO Sudden Ionospheric Disturbance Report April 2018 Observers: A118 A119 A120 A122 A125 A131 A134 A138 A141 A143 A146 A147 A94 A96 A97 YYMMDD Event Peak Importance 180401 1259 1- A141 - XRA 180401 1308 1+ A131 - XRA 180414 1920 1- A146 - XRA 180418 1840 1- A146 - XRA 180420 2213 1- A146 - XRA 180420 2221 2 A141 - XRA 180420 2222 2+ A141 - XRA 180420 2222 2+ A141 - XRA 180420 2223 1- A141 - XRA 180424 2144 1- A141 - XRA 180430 1914 1- A141 - XRA 180430 1915 1+ A141 - XRA ************************************************** Importance Summary - Apr 2018 1- events: 7 1 events: 0 1+ events: 2 2 events: 1 2+ events: 2 3 events: 0 3+ events: 0 ------------------ Total events: 12