National Centers for Environmental Information / National Operational Model Archive and Distribution System Catalog https://www.ncei.noaa.gov/thredds/catalog/avhrr-polar-pathfinder-files/catalog.html

Dataset Size Last Modified
     Folder  AVHRR Polar Pathfinder: File access   --
         Folder  nhem/   --
         Folder  shem/   --

NCEI THREDDS Server at NCEI see Info
THREDDS Data Server [Version 4.6.14 - 2019-07-23T11:04:31-0600] Documentation