HEK F/E FRM Active Region - HMI HARP

[Jack Ireland]

Often, HMI HARP HEK entries seem to come in pairs, or close to pairs. For example:

http://hek.delphi.nascom.nasa.gov/?date=2012-05-06T21:12:41.000Z&imageScale=1.2102204&centerX=489.49382096879884&centerY=458.5928514710999&imageLayers=%5BSDO,AIA,AIA,193,1,100%5D,%5BSDO,AIA,AIA,335,1,50%5D&eventLayers=%5BAR,HMI_HARP,1%5D,%5BCC,all,1%5D,%5BCD,all,1%5D,%5BCH,all,1%5D,%5BCJ,all,1%5D,%5BCE,all,1%5D,%5BCR,all,1%5D,%5BCW,all,1%5D,%5BEF,all,1%5D,%5BER,all,1%5D,%5BFI,all,1%5D,%5BFA,all,1%5D,%5BFE,all,1%5D,%5BFL,all,1%5D,%5BLP,all,1%5D,%5BOS,all,1%5D,%5BPG,all,1%5D,%5BSG,all,1%5D,%5BSP,all,1%5D,%5BSS,all,1%5D&eventLabels=true

Looking at the feature and event times, it seems like HMI HARP is making two determinations of what constitutes an active region. See also http://jsoc.stanford.edu/jsocwiki/HARPDataSeries