Study 000457:

ACRONYMS: ab_ch_offlimb_sands

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This study will focus on the determination of non-thermal velocities of different ions
off-limb above a polar coronal hole. In a previous campaign
(HOP NUMBER: 103, EIS STUDY: 340) we already performed with Hinode/EIS a long-duration
sit & stare observation, allowing us to measure the non-thermal velocity of the
FeXII ions up to ~0.4 solar radii off-limb.

The target of this second study will be:

- to make a second attempt to distinguish between plume and inter-plume regions,
dragged by solar rotation in the EIS field of view; 

- to include more lines covering different ionization stages, in particular of Fe element,
in order to study non-thermal velocities of different ions and different charge-to-mass
ratios.

This study will be also performed in coordination with the SOHO/UVCS spectrometer,
which will acquire EUV spectra at 0.7 solar radii above the limb, in order to compare
EIS non-thermal velocities with those measured at higher altitude by UVCS.

target:			polar coronal hole (off-limb)
slit/slot:		1"
raster:			sit and stare
FOV:			1" X 512"
center:			X=0", Y=-1162" (off limb)
exposure time:		500s
# of exposures:		155
Compression:		250 Mbits (****switch to DPCM****)
raster duration:	22h 41m 19s

2) POINTING
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South polar coronal hole, observed off limb at central meridian (slit center: X=0", Y=-1162").

3) USE/INSTRUCTIONS TO PLANNERS
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Run SNS study (ab_ch_offlimb_sands.def).

4) WARNINGS
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Please run the study CONTINUOUSLY, even through the SSAs.

CONTACT:
name:		Dr. Alessandro Bemporad
institute:	INAF-Turin Astronomical Observatory
email:		bemporad@oato.inaf.it
phone:		+39 011 8101 954
fax:		+39 011 8101 930