Topical Issue - Space Weather Instrumentation
Open Access
Technical Article

Table 1

Specifications of imaging instruments installed in T1 and T4.

T1
T4
Hα Ca K G-band Continuum
Objective lens D = 125 mm, f = 2250 mm (Nikon) D = 125 mm, f = 2250 mm (Nikon)
Beam splitter 50/50 cube beam splitter (Edmund Optics)
Filter (λ 0/FWHM) Prefilter 656.3 nm/2.7 nm Heat Rejection 400 nm/50 nm 430.5 nm/1.0 nm ND 1%
(Andover) (Edmund Optics) (Materion Barr) G530 530 nm/50 nm (Hoya)
Lyot 656.3 nm/0.025 nm (Zeiss) 393.4 nm/0.2 nm ND 10% BK7 spacer
ND 50% (DayStar) IR-cut HA-50 (Hoya)
Field lens D = 40 mm, f = 120 mm D = 40 mm, f = 120 mm D = 40 mm, f = 120 mm
Imaging lens 50 mm F2.8 Macro (Sigma) 50 mm F2.8 Macro (Sigma) 50 mm F2.8 Macro (Sigma)
Camera Andor Zyla 4.2 Bitran BH-52L Photonfocus MV1-D2080-160
Detector format 2048 × 2048 2048 × 2048 2080 × 2080
6.5 × 6.5 μ/pixel 7.4 × 7.4 μ/pixel 8 × 8 μ/pixel
A/D, Frame rate 16 bit, 100 fps 12 bit, 8 fps 12 bit, 34 fps
Spatial Sampling 1.1″ pixel−1 1.0″ pixel−1 1.0″ pixel−1
Cadence every 30 s (Hα center) every 30 s every 5 min every 5 min
every 150 s (H offband)
Exposure 1 ms/4 ms/16 ms 160 ms (320 ms, 640 ms)a 0.7 ms (1.4 ms, 2.8 ms)b 1.6 ms (3.2 ms, 6.4 ms)b
Frame selection every 30 images every 10 images every 30 images every 30 images
a

Owing to the deterioration of the filter, prolonged from 10 ms (20 ms, 40 ms) at the beginning.

b

Before the installation of the Ca K system, exposure times were half of these values.

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