PPT Slide
a) Select a slit or slot as required. Four slit positions are available.
1" for optimum spatial sampling, a 40" slot for monochromatic imaging with no blending of stronger lines, a 2” slit for fastest time cadence, and ” slit for spectroheliograms.
b) Point EIS in the E-W direction with a coarse pointing in the range +/- 15' with an accuracy of +/- 3". The coarse pointing will be used for approximate pointing to targets.
c) Fine pointing in the range 0 - 8 arc min.
d) EIS FOV is 480" x 512" (480" is the fine pointing range - set by optical aberrations, and 512" is the maximum image height on the CCD).
e) Stability during an observation of 1" in 10 s (the average exposure time for observation of an active region loop).
Spacecraft 3s stability is 0.5” in 2s, 1.1” in 20s and 1.7” in 1 min.
f) Determine EIS pointing with a fine pointing accuracy of 0.5". It is required to point
EIS with accuracy greater than the spatial resolution of 2”.
Instrument Design Requirements - Pointing and Field of View