Purpose: This sequence is used at large heliocentric heights to determine proton temperature, outflow velocity, electron density, and OVI density. The primary observable quantities are Ly-alpha profile, OVI intensity, and visible polarized radiance. This mode is expected to be used 2.5% 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
radial position 3.5 to 10.0 R
(TBC). There are 10 mirror positions,
with step size ranging from 0.5 to 1.0 R
(TBC).
This observation may involve offset pointing prior to the observation (but not during the observation). The purpose is to ``over-occult" and thus reduce stray light levels. In that case the ``Offset-Pointing" type of safety checking would be used rather than the ``Sun-center" type.
At each mirror position, measure resonantly scattered Ly-alpha profile.
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.
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.