I think they are hdf4. There are many ways to find that out - hdf cli (h5ls for hdf5) or visualisation tools (hdfview, panoply, etc.). You should always contact the data provider (ICARE support; [email protected]) if in dount.
In fact, I have found the format in the archive.However, What I mean is when I chose some specific areas ,some days.The format is not the former format. If I download plenty of data .It is difficult to analysize the content in that format.