AAVSO Sudden Ionospheric Disturbance Report August 2021 Observers: A118 A119 A120 A122 A131 A134 A146 A148 A149 A150 A152 A153 A96 A97 YYMMDD Event Peak Importance 210809 0013 1- A122 - QUAL 210813 2109 1 A153 - XRA 210820 1552 1- A153 - XRA 210820 1558 1 210820 1602 1 210820 2151 2+ A153 - XRA 210822 0059 1- A122 - XRA 210822 0406 1- A122 - XRA 210822 1020 1+ 210822 1419 1+ A118 - QUAL 210824 1449 2+ A119 - XRA 210825 0119 1- A122 - XRA 210825 0148 2+ A134 - QUAL 210826 2308 1- A122 - XRA 210826 2325 1 A153 - XRA 210827 1258 1+ A131 - FLA 210827 2021 1- A97 - XRA 210827 2106 2+ 210828 0519 1 A134 - XRA 210828 0557 1+ A96 - XRA 210828 0609 3 210828 0614 3 A152 - XRA 210828 0614 1+ 210828 0627 3 210828 0649 2+ A134 - QUAL 210828 0848 2+ 210828 0855 2+ A152 - XRA 210828 1021 2+ A131 - FLA 210828 1154 2 210828 1201 1 A152 - XRA 210829 0009 1+ A122 - QUAL 210829 0043 1+ A153 - XRA 210829 0832 1+ A119 - XRA 210829 1004 2 210829 1727 1+ 210830 1626 1- A153 - XRA 210830 1934 2 A153 - XRA 210830 2136 2 A153 - XRA ************************************************** Importance Summary - Aug 2021 1- events: 8 1 events: 6 1+ events: 9 2 events: 4 2+ events: 8 3 events: 3 3+ events: 0 ------------------ Total events: 38