AAVSO Sudden Ionospheric Disturbance Report May 2021 Observers: A118 A119 A120 A122 A138 A141 A146 A147 A148 A152 A96 A97 YYMMDD Event Peak Importance 210501 1953 1- A147 - XRA 210507 1900 2+ 210507 1900 2 210508 1240 1 A152 - QUAL 210508 1257 2 210508 1842 2+ 210508 1844 2 210509 0423 1- A152 - XRA 210509 0432 1- A152 - XRA 210509 1359 2 210509 1409 2 A148 - XRA 210509 1444 1 210509 1539 1- A146 - QUAL 210509 1714 1- A146 - QUAL 210512 0937 1+ 210512 1001 2 A152 - QUAL 210521 1929 1- 210522 0240 2+ A122 - XRA 210522 0618 1 210522 1124 1 210522 1534 2 210522 1539 2 210522 1618 1 210522 1712 1+ 210522 2139 1 210522 2311 1- A122 - XRA 210523 0450 1- 210523 0923 1+ 210523 1109 2 210523 1707 1- 210526 0756 1- A152 - XRA 210526 0804 1- A152 - XRA 210526 0955 1 A118 - XRA 210526 0956 1- 210526 1431 1- 210526 1716 1- 210526 2042 1+ 210526 2136 2 A141 - XRA 210527 1409 1- A146 - QUAL 210527 1459 1- A146 - QUAL 210527 1530 1- A146 - QUAL 210527 2313 1 A141 - XRA 210527 2335 2+ A122 - QUAL 210528 0955 1- 210528 0956 1 210528 1626 1- A146 - QUAL 210528 2245 2+ A148 - QUAL 210528 2245 2+ A148 - QUAL 210528 2303 2+ 210529 0352 1- 210529 0550 1 A152 - XRA 210529 0550 1 A152 - XRA 210529 1313 1- A146 - QUAL 210531 1450 1- A146 - QUAL 210531 2127 1- A141 - QUAL 210531 2205 1- A146 - QUAL ************************************************** Importance Summary - May 2021 1- events: 24 1 events: 11 1+ events: 4 2 events: 10 2+ events: 7 3 events: 0 3+ events: 0 ------------------ Total events: 56