Study 000264:

ACRONYM: EL_WHI_CH_LIMB

This study is aimed at investigating the density, temperature and
abundance composition of equatorial coronal holes at the solar limb
as a function of latitude by capitalizing on the full length of the EIS
slit (512") and of the number of ions included inthe full EIS range.
Deep exposures are taken in order to 1) maximize the signal-to-noise
ratio and observe faint lines from a multitude of elements, and
2) reduce the data volume. This study is developed in response
to the Whole Heliospheric Interval and is meant to be run together
with a similar study for SOHO/UVCS.

Target: equatorial coronal hole
Exposure time: 600s
Raster: sit'n'stare
Slit: 2"
Step size: N/A
FOV: 2"x512"
Duration: 33 min.

POINTING:

equatorial coronal hole, with slit center more or less at
the equator, unless the coronal hole is located at v. high or v.low
latitudes, in which case the center of the slit should be more or
less at the latitude of the center of the coronal hole. Both west and east
limb are OK. the raster should be run close to the limb, say at around
1000" (20-40" above the limb).

INSTRUCTIONS TO PLANNERS:

Run this study once a day as long as the equatorial hole is at the limb.

WARNINGS

Avoid SAA.