On Thu, 24 May 2012 12:16:32 -0700 (PDT), Dean Keaton
<
Deann....@hotmail.com> wrote:
>On clips from the LASCO-camera on YouTube one can se white "rays"
>emanating from the sun. What are they made of? Hydrogen plasma? What
>is their speed?
They are coronal streamers- the same thing seen in white light during
total eclipses. They are plasma structures, with elemental abundances
similar to the photosphere- about equal amounts of H and He, and
slightly smaller amounts of C, N, O, Ne, Ca, Fe, and many others. So
not primarily H. The streamers are a major source of the solar wind,
so they show velocities of 400-750 km/s, mostly on the higher end
(corresponding to the fast solar wind).