Procedure definitions and options

Contents
  • 304A sequence
  • 195A sequence OPTION 1 (no clears, compression)
  • 195A/171A sequence OPTION 2 (no clears, compression)
  • 195A/171A sequence OPTION 3 (1 clear, no compression, cadenced, short exposure)
  • 195A sequence OPTION 4 (1 clear, no compression)
  • back to Shutterless main page



    304A sequence

    Parameters
    Passband 304 A
    Compression Rice
    Binning no
    CCD clears no
    Commanded exposure 0s
    Number of images 3 x 40
    Subfield size 13 x 13 blocks
    Timing control free running (as fast as possible)
    Target approx. quarter disc, one corner=disc center

    LOC coordinates [P1_X:P2_X,P1_Y:P2_Y]

    Quadrant NE (upper left) : [ 97: 512, 148: 563] Quadrant NW (upper right) : [ 513: 928, 148: 563]
    Quadrant SE (lower left) : [ 97: 512, 564: 979] Quadrant SW (lower right) : [ 513: 928, 564: 979]

    Initial estimates
    Estimated CCD readout time 8.56 s +/- 0.01 s
    Estimated compression time 47 s +/- 10 s (compression ratio=2.5)
    Expected cycle time 8.6 + 47= 55.6 s
    Expected duration 11.1 mins
    Expected effective total exposure 47 + (2x 8.6 "background")= 64.2 s

    Some remarks

    Options
    Subfield size 13x13 blocks 12 (E-W) x 13 (N-S) blocks 12 x 12 blocks
    Readout time 8.56s 7.90s 7.90s
    Processing time 60s 55.38s 51.12s
    Cadence 68.55s 63.28s 59.02s
    Dataflux 75.8 blocks/min (1.952 compression ratio) 75.8 blocks/min (1.952 compression ratio) 75.0 blocks/min (1.952 compression ratio)
    Rate of accumulation in buffer 9.78 blocks/min 9.78 blocks/min 9.00 blocks/min
    Accumulation in 120 min 1173 blocks (77%) 1173 blocks (77%) 1080 blocks (71%)



    195A sequence OPTION 1 (no clears, compression)

    Parameters
    Passband 195 A
    Compression Rice
    Binning no
    CCD clears no
    Commanded exposure 0s
    Number of images 3 x 40
    Subfield size 13 x 13 blocks
    Timing control free running (as fast as possible)
    Target approx. quarter disc, one corner=disc center

    LOC coordinates [P1_X:P2_X,P1_Y:P2_Y]

    Quadrant NE (upper left) : [ 96: 511 , 512 : 927] Quadrant NW (upper right) : [ 512 : 927 , 512 : 927]
    Quadrant SE (lower left) : [ 96 : 511 , 96 : 511] Quadrant SW (lower right) : [ 512 : 927 , 96 : 511]

    Initial estimates
    Estimated CCD readout time 8.56 s +/- 0.01 s
    Estimated processing time 60 s +/- 5 s (compression ratio=2.5)
    Expected cycle time 8.6 + 60 ~ 69s
    True total effective exposure 60 + 8.6= 68.6 s
    Fraction of drifted exposure 8.6/60= 0.1427
    Estimated background 800DN (disk QS)/*0.14*0.8=89 DN
    Data flux 148 blocks/min (59 bl/min with 2.5 compression factor)
    Estimated total number of blocks 120x13x13/2.5 blocks=8112 actual blocks
    Telemetry capacity 137.2min x 66(bl/min) + 1525bl= 10580 blocks
    Buffer level at the end empty!

  • Expected Counts: about 5.8x a normal synoptic exposure, with a degraded response at 20-25% of initial response (situation in Dec 2000).

    Region Expected counts (DN)
    CH 350
    QS 700
    AR 3600
    Histo 99%level 3200
    Histo 99.9% level 5800
    Histo top 8000

    Some remarks



    195A/171A sequence OPTION 2 (no clears, compression)

    Parameters
    Passband 195 A
    Compression Rice
    Binning no
    CCD clears no
    Commanded exposure 0s
    Number of images 3 x 70
    Subfield size 9 x 10 blocks
    Timing control free running (as fast as possible)
    Target approx. quarter disc, one corner=disc center

    LOC coordinates [P1_X:P2_X,P1_Y:P2_Y]

    Quadrant NE (upper left) : [ 224: 511 , 512 : 799] Quadrant NW (upper right) : [ 512 : 799 , 512 : 799]
    Quadrant SE (lower left) : [ 224 : 511 , 224 : 511] Quadrant SW (lower right) : [ 512 : 799 , 224 : 511]

    Initial sstimates
    Estimated CCD readout time 5.76 s +/- 0.01 s
    Estimated processing time 32 s +/- 5 s (compression ratio=2.5)
    Expected cycle time 5.8 + 32 ~ 38s
    True total effective exposure 32 + 5.8 = 38 s
    Fraction of drifted exposure 5.8/38 = 0.153
    Estimated background 350DN (disk QS)/*0.15*0.8 = 43 DN
    Data flux 142 blocks/min (57 bl/min with 2.5 compression factor)
    Estimated total number of blocks 210x90/2.5 blocks = 7560 actual blocks
    Telemetry capacity 133min x 66(bl/min) + 1525bl= 10303 blocks
    Buffer level at the end empty!

    Expected Counts: about 3.8x a normal synoptic exposure, with a degraded response at 20-25% of initial response (situation in Dec 2000).

    Region Expected counts (DN) 195AExpected counts (DN) 171A
    CH 200
    QS 400800
    AR 2000
    Histo 99%level 18003500
    Histo 99.9% level 32006100
    Histo top 4500

    Some remarks



    195A/171A sequence OPTION 3 (1 clear, no compression, cadenced, short exposure)

    Parameters
    Passband 195 A (or 171A)
    Compression no
    Binning no
    CCD clears 1 clear
    Commanded exposure 30s (must be < 40s)
    Number of images 3 x 40
    Subfield size 9 x 10 blocks
    Timing control FIXED DELAY = 71s
    Target approx. quarter disc, one corner=disc center

    LOC coordinates [P1_X:P2_X,P1_Y:P2_Y]

    Quadrant NE (upper left) : [ 224: 511 , 512 : 799] Quadrant NW (upper right) : [ 512 : 799 , 512 : 799]
    Quadrant SE (lower left) : [ 224 : 511 , 224 : 511] Quadrant SW (lower right) : [ 512 : 799 , 224 : 511]

    Initial estimates

    Initial estimates
    Estimated CCD readout time 5.76 s +/- 0.01 s
    Estimated processing time 23.4 s +/- 5 s (compression ratio=2.5)
    Max allowed exposure time 71 - 5.8 - 23 ~ 42s
    True total effective exposure commanded exp.(30s) + 0.5 x 5.76s = 33s
    Fraction of drifted exposure 2.9/33 = 0.088
    Estimated background 350DN (disk QS)/*0.088 = 25 DN
    Data flux 76 blocks/min
    Estimated total number of blocks 120x90 = 10800 actual blocks
    Telemetry capacity 142min x 66(bl/min) + 1525bl= 10897 blocks
    Buffer level at the end 1428 blocks (94%)

    Expected Counts: about 3.8x a normal synoptic exposure, with a degraded response at 20-25% of initial response (situation in Dec 2000).

    Region Expected counts (DN) 195AExpected counts (DN) 171A
    CH 200
    QS 350600
    AR 1800
    Histo 99%level 15002500
    Histo 99.9% level 28004500
    Histo top 4200

    Some remarks



    195A sequence OPTION 4 (1 clear, no compression)

    Parameters
    Passband 195 A
    Compression no
    Binning no
    CCD clears 1 clear
    Commanded exposure 42s
    Number of images 3 x 40
    Subfield size 9 x 10 blocks
    Timing control free running (as fast as possible)
    Target approx. quarter disc, one corner=disc center

    LOC coordinates [P1_X:P2_X,P1_Y:P2_Y]

    Quadrant NE (upper left) : [ 224: 511 , 512 : 799] Quadrant NW (upper right) : [ 512 : 799 , 512 : 799]
    Quadrant SE (lower left) : [ 224 : 511 , 224 : 511] Quadrant SW (lower right) : [ 512 : 799 , 224 : 511]

    Initial estimates
    Estimated CCD readout time 5.76 s +/- 0.01 s
    Estimated processing time 23.4 s +/- 5 s (compression ratio=2.5)
    Expected cycle time 5.8 + 23.4 + 42 ~ 71s
    True total effective exposure 42 + 0.5 x 5.76 = 45 s
    Fraction of drifted exposure 2.9/45= 0.065
    Estimated background 480DN (disk QS)/*0.065*0.8 = 25 DN
    Data flux 76 blocks/min
    Estimated total number of blocks 120x90 = 10800 actual blocks
    Telemetry capacity 142min x 66(bl/min) + 1525bl= 10897 blocks
    Buffer level at the end 1428 blocks (94%)

    Expected Counts: about 3.8x a normal synoptic exposure, with a degraded response at 20-25% of initial response (situation in Dec 2000).

    Region Expected counts (DN)
    CH 230
    QS 450
    AR 2400
    Histo 99%level 2100
    Histo 99.9% level 3800
    Histo top 4800

    Some remarks