[snowfox]

Yeah, put me on the ping list. When they say relatively cool, they mean what, 1.2 or 1.3 million K, as compared to 1.5 MK?

[petuniasevan]

OK, you're on the list. :>)

Most of the material in prominences/filaments is 5000-8000 K. That's practically ice-cold compared to the hot, thin coronal gases.