Cycle 25 observations in SDO HMI imagery

Date Time Location Classification N spots @ 1K Image (4K res.)   Comments
20181117 20:00
N27E11
BXO 2    

 

20181108 12:00
N26W18
HRX 1  

Largest cycle 25 spot so far

20181009 11:30
S29W10
AXX 1    
20181009 11:30
S49E29
AXX 1    
20180531 12:00
S29W51
BXO
2
   
20180409 12:00
S31E09
CRO
2
   
20180219 09:30 N53W18 AXX 1    
20180126 21:00 S37W07 AXX 1   negative polarity spot not visible at 1K
20170910 12:00 N36E09 BXO 2    
20170828 12:00 N43W13 AXX 2   negative polarity spot too small

While smaller spots with the correct polarity alignment of cycle 25 regions have been observed at high latitude locations as early as 2016, this overview will only include spots large enough to have been visible at a 1K resolution. In the case of reversed polarity cycle 24 regions, those that are not at a sufficiently high latitude (ie. 30 degrees or more), are considered most likely to belong to cycle 24 and will not be included in this list until closer to the actual solar cycle minimum (likely to be sometime between August 2018 and February 2019).