LASCO Level-1 Processing Pipeline and Calibration:

Status & Overview

NBR

2002/07/29

Software Status

Top level procedure is operational and part of SolarSoft.
Has been used by various scientists worldwide.
Needs minor work (subfields, at least).

Calibration Processing Steps

(Applies to C3 only)

Subtract bias
Divide by (corrected) exposure time
Apply "fuzzy logic" to replace missing blocks
Multiply by calibration factor
Multiply by (inverse) vignetting function/array
Subtract stray light
Distortion correction
Multiply by (distortion corrected) mask of occulter/pylon/outer edge and missing blocks if > 17

reduce_level_1.pro

Procedures and Files

Key: ( C3 only ) ( Header info. only ) ( [ C2 values] )

c3[2]_calibrate.pro

get_exp_factor.pro

offset_bias.pro

c3[2]_calfactor.pro

0.00503 [0.0286]

get_cal_name.pro

C3clearvig_nrl.fts [inv_vigc2_512506.fts]

C3ramp.fts

3m_clcl_all.fts

fuzzy_image.pro

c3[2]_warp.pro

occltr_cntr.pro

516.284, 529.489 [512.634, 505.293]

get_sec_pixel.pro

subtense.pro

56.0 [11.9] arcsec/pixel

c3[2]_distortion.pro

distortion_coeffs.pro

warp_tri.pro

get_cal_name.pro

c3clearmask3.fts

c3[2]nullblocks.sav

get_sun_center.pro & get_solar_roll.pro

get_roll_or_xy.pro

c3[2]_rollxy_yymmdd.dat

get_img_leb_hdr_updates.pro

adjust_date_obs.pro

c2_time_offsets.dat

get_solar_radius.pro

sohoephem.pro

reduce_statistics2.pro