Mr. KAISER: Well, Ike is moved off-shore of south of Cuba, into the Caribbean, and back over water which means perhaps a little bit of intensity increase as it again joins that source of energy over those warm waters.
"It's correlating the increasing intensity in different bands that provides really important clues about the structure of the source, " Prof Madejski - a co-investigator on the NuStar X-ray telescope, told BBC News.