AAVSO Sudden Ionospheric Disturbance Report December 2023 Observers: A112 A118 A119 A131 A136 A138 A141 A148 A150 A152 A153 A97 YYMMDD Event Peak Importance 231201 1015 1- A131 - QUAL 231201 1158 1+ 231201 1204 2 A152 - QUAL 231201 2116 1+ 231202 1945 1+ A97 - QUAL 231203 0806 2 231205 0644 1 A131 - QUAL 231205 0859 1- 231205 1205 1+ 231205 1337 1- 231205 1355 1- 231205 1531 1- A97 - QUAL 231205 1725 1+ 231205 1803 2+ A148 - QUAL 231205 1926 1+ A148 - QUAL 231205 2121 2 A148 - QUAL 231206 0819 1 231206 1354 1- A136 - XRA 231206 1607 1+ 231206 1856 1 231206 2141 2 231207 2052 1- A148 - XRA 231208 1730 1 A97 - XRA 231208 2306 1+ 231209 0643 1 A131 - XRA 231209 0953 1+ 231209 1049 1+ 231209 1311 1+ 231209 1935 1 231210 0648 1+ A131 - QUAL 231210 1042 1+ 231210 1154 1+ 231210 1425 1 A97 - XRA 231210 2046 1 231210 2243 1- A153 - XRA 231211 1105 1 231211 1307 1- A97 - XRA 231212 1341 1 231213 1519 2+ A97 - XRA 231214 0745 2+ A131 - XRA 231214 1346 2 231214 1347 1+ 231214 1640 1 A141 - QUAL 231214 1640 1 A141 - QUAL 231214 1657 1+ 231215 0710 1- 231215 0730 2+ 231215 2128 1- A148 - XRA 231216 1355 2+ A97 - XRA 231216 1411 2 A148 - XRA 231216 1955 1- A148 - XRA 231217 1813 1 A148 - XRA 231217 2017 1+ 231217 2130 1- A148 - XRA 231219 1538 2 231219 2046 1- A150 - QUAL 231219 2346 1- A112 - XRA 231220 0935 2 231220 1722 1+ 231220 1756 2+ A150 - QUAL 231220 1842 1- 231221 1623 1- A97 - XRA 231221 1803 1 A97 - XRA 231221 1906 1- A97 - XRA 231222 0926 1 A152 - XRA 231223 1742 1 A97 - XRA 231224 1116 1+ 231224 1648 2 231224 1944 2+ 231229 0755 2 A131 - XRA 231229 2016 1+ 231230 1520 1- 231230 2151 1- A153 - XRA 231231 0819 2+ A131 - XRA 231231 0911 1- 231231 1205 1 A131 - XRA 231231 1248 1 231231 1256 1+ 231231 1840 1 A97 - XRA 231231 1908 2 231231 2145 2+ 231231 2147 2+ ************************************************** Importance Summary - Dec 2023 1- events: 21 1 events: 19 1+ events: 21 2 events: 11 2+ events: 10 3 events: 0 3+ events: 0 ------------------ Total events: 82