Study 000618:

Updated by M. Whillock, MSSL, 20220624.
Copied from study id 0000582, increased exposure time by 50%.

ACRONYM: HOP81_new_study_v2

This study is a modified version of the original used for the
HOP 81 polar monitoring campaign. It was designed to perform a
large FOV scan of the polar region using low temperature lines
(log T < 6.2) coordinated with SOT/SP measurements of the 
magnetic field. The new version adds higher temperature lines
from Fe XIII-XVI and high FIP element lines from S X and Ar XI,
to allow tracking of abundances variations in the polar region
during the solar cycle. 

The scan dimensions are preserved from the original to keep 
continuity with the past (2006-2018). However, the 2" slit is 
now used to increase counts, and the FOV is scanned faster so
that the study can be run between eclipses.

TARGET        : Coronal hole
EXPOSURE TIME : 75s
RASTER        : Scanning
SLIT          : 2" (was 1")
STEP_SIZE     : 4" (was 1")
FOV           : 322"x384"
SPECTRAL WIND.: 24 (was 12)
DATA COMP.    : DCPM   
RASTER DURATON: 1h48m58s
DATA VOLUME   : 140 Mbits (was 150 Mbits)
LINES         : Fe VIII, Fe X, Fe XI, Fe XII, Fe XIII,
                He II, O V, Mg VI, Mg VII, Si VII, Si X
                Fe IX, Fe XIV, Fe XV, Fe XVI, S X, Ar XI

POINTING: 
---------

Polar coronal hole with fixed pointing.
Make sure to cover SOT FOV and the solar limb.

INSTRUCTION TO PLANNERS:
------------------------

Start this study at the beginning of the SAA free period (roughly 10-15UT)
The later part may coincide with a short SAA.

WARNING:
--------

Avoid SAAs as much as possible (SAA degrades data compression factors and
mutilates the data)