  Eta Carinae's spectroscopic events (periastron passages) in 2003, 2009, and
2014 differed progressively. He II 4687 and nearby N II multiplet 5 have
special significance because they respond to very soft X-rays and the ionizing
UV radiation field (EUV). HST/STIS observations in 2014 show dramatic increases
in both features compared to the previous 2009.1 event. These results appear
very consistent with a progressive decline in the primary wind density,
proposed years ago on other grounds. If material falls onto the companion star
near periastron, the accretion rate may now have become too low to suppress the
EUV
