Purpose: Measurement of proton temperature and outflow velocity; electron temperature and density; OVI temperature, density, and outflow velocity. Primary observable quantities are resonant and electron scattered Ly-alpha profile, OVI profiles, and visible polarized radiance. This mode is expected to be used 10% of the time.
Description: Duration 1 to 3 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
selectable radial
position 1.5 to 3.5 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 (not selectable on command) increase with height in the corona.
The OVI 1032/1037 Å 
profiles are also measured.
A series of exposures is obtained with slightly different grating positions
(``dither motion"). There are 20 grating positions with steps of 0.01
Å (TBC).
Dwell times increase with height in the corona.
Polarized visible radiance will be measured at one position
along the slit for each mirror position.