Found this description, on ESA website, for an old SOHO picture taken around 304 Å : "304 Å : spectral line emitted by ionised helium (He II). Corresponding to

Found this description, on ESA website, for an old SOHO picture taken around 304 Å : "304 Å : spectral line emitted by ionised helium (He II). Corresponding to a temperature of about 60,000 Kelvin, emission in this line shows the upper chromosphere of the Sun." That gives another meaning to the expression "hot like HeII" ... sorry ;) (but apparently it's less hot that the pictures in 94 Å linked to emission of Fe XVIII with temperature of about 7,000,000K)