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Earth, Planets and Space

Table 2 Filter characteristics, typical sensitivities, and exposure times of the all-sky imagers

From: Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network

Filter number

Species

Observation wavelength (nm)

Filter bandwidth (nm)

Typical sensitivity (count/r/s)

Exposure time (s)

Binning

Camera #7 (C7, Athabasca, calibration date: November 18, 2014, 512 × 512)

 1

OI

557.7

1.760

0.2000

5

2 × 2

 2

OI

630.0

1.650

0.3190

30

2 × 2

 3

OH

720–910

190.000

–

1

2 × 2

 4

Hb

486.1

1.320

0.1930

40

2 × 2

 5

bg

572.5

1.630

0.2140

15

2 × 2

 6

OI

844.6

1.200

0.1480

25

2 × 2

 7

Na

589.3

1.500

0.5430

15

2 × 2

Camera #14 (CE, Zhigansk, calibration date: May 18, 2015, 512 × 512)

 1

OI

557.7

1.636

0.2497

30

2 × 2

 2

OI

630.0

1.645

0.3970

40

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

OI

865.0

9.837

0.1853

40

2 × 2

 5

bg

572.5

1.515

0.2935

30

2 × 2

Camera #16 (CG, Kapuskasing, calibration date: December 26, 2016, 1024 × 1024)

 1

OI

557.7

1.783

0.5185

15

2 × 2

 2

OI

630.0

1.644

0.5343

30

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

Hb

486.1

1.346

0.3558

30

2 × 2

 5

bg

572.5

1.498

0.4542

30

2 × 2

Camera #17 (CH, Nain, calibration date: December 26, 2016, 1024 × 1024)

 1

OI

557.7

1.757

0.4923

15

2 × 2

 2

OI

630.0

1.677

0.5123

30

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

Hb

486.1

1.373

0.3455

30

2 × 2

 5

bg

572.5

1.495

0.4567

30

2 × 2

Camera #18 (CI, Nyrola, calibration date: December 26, 2016, 1024 × 1024)

 1

OI

557.7

1.742

0.5715

15

2 × 2

 2

OI

630.0

1.632

0.6019

30

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

Hb

486.1

1.375

0.4115

30

2 × 2

 5

bg

572.5

1.509

0.5472

30

2 × 2

Camera #19 (CJ, Gakona, calibration date: December 26, 2016, 1024 × 1024)

 1

OI

557.7

1.781

0.4966

15

2 × 2

 2

OI

630.0

1.685

0.5504

30

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

Hb

486.1

1.364

0.3621

30

2 × 2

 5

bg

572.5

1.492

0.4586

30

2 × 2

Camera #20 (CK, Istok, calibration date: December 26, 2016, 1024 × 1024)

 1

OI

557.7

1.717

0.5190

15

2 × 2

 2

OI

630.0

1.627

0.6032

30

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

Hb

486.1

1.344

0.4036

30

2 × 2

 5

bg

572.5

1.508

0.5242

30

2 × 2

Camera #21 (CL, Husafell, calibration date: December 26, 2016, 1024 × 1024)

 1

OI

557.7

1.769

0.4860

15

2 × 2

 2

OI

630.0

1.614

0.5493

30

2 × 2

 3

OH

>720

–

–

1

2 × 2

 4

Hb

486.1

1.379

0.3778

30

2 × 2

 5

bg

572.5

1.512

0.5030

30

2 × 2

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