Purpose: Measurement of coronal electron temperature in additon to the measurements of Coronal Observation 1. The primary observable quantities are resonant and electron scattered Ly-alpha profile, OVI intensity, visible polarized radiance. Expected to be used 5% of the time.
Description: duration 2 to 4 hours. There will be several versions with
different dwell times, each one optimized for a particular target
(streamers, quiet corona, coronal holes). Scan telescope mirror from
radial position 1.5 to 5.0 R
(TBC). There are 10 mirror positions,
with step size ranging from 0.2 to 0.5 R
(TBC). At each mirror
position, first measure resonantly scattered Ly-alpha profile.
Then move Ly-alpha grating such that resonantly scattered line falls on
blocked section of XDL detector, and measure the (much broader and
weaker) electron scattered Ly-alpha profile.
Dwell times increase with height in the corona.
Entrance slit, grating, and detector mask positions are selectable on
commands.
The OVI 1032/1037 Å 
intensities are also measured.
Polarized visible radiance will be measured at one position
along the slit for each mirror position.