Introduction
Summary of LASCO/EIT What is LASCO? What is EIT? (external link) FAQ Realtime Images RealTime Movies (SOHO Movie Theater) Download LASCO Data Data Products Image Gallery Movie Gallery Processing Levels FITS Header Keywords Data Policy Wavelet images/movies Coronal Mass Ejections Eclipse Observations LASCO Calibration LASCO C3 Planet transits (via Sungrazer) Team and Operations Resources LASCO/C1 at MPAe (Germany) LASCO at LAS (France) LASCO Handbook Technical Notes Detailed Documentation Acronyms Solwind Images and CMEs SOHO Home page SOHO and SOHO Instruments Other Solar Satellites and Observatories |
LASCO C3 Level 1 ProcessingAction Item list from July 2002 meeting at NRL(1) Check impact of "3m_clcl_all.fts" during MISSING BLOCKS procedures.None: img[zz] = newimg[zz]
(2) Convert "C3[2]nullblock.sav" to ASCII.Done. See(3) Check dynamic range of processed images to see if STORAGE REQUIREMENTS can be reduced.
BSCALE =
9.91806E-14 / Data value = FITS value x BSCALE + BZERO
DATAMIN =
2.05145E-12 / Minimum Value Not Equal to Zero
Results from 10 images (1024x1024) from 1-10 Dec. 1996 (darr = unscaled - scaled) (units DN/sec):IDL[calliope]>print_mom,ABS(darr[dlt10]) ; for stats, limit to values less than 10Mean: 0.0413899 Variance: 0.00470876 Skewness: 67.4433 Kurtosis: 5840.83 Std Dev: 0.0686204 IDL[calliope]>maxmin,darr 19501.0 0.00000 -0.0997656
Results from series of one image every 20 days (43 total):
(4) Look at GEOMETRIC DISTORTION CORRECTION, specifically the rings in the warped image. (w/ JEFF MORRILL and MIKE ANDREWS) [CHAIR]IDL[calliope]>rndm=randomn(5,1024,1024) Ring in warped image (such as here):IDL[calliope]>rdif=wrndm2-rndm Pattern in warped image
Bottom line: pattern is IN THE NOISE, and much less significant than other errors(4.5) Where is distortion function from?
(5) Develop procedure to map MISSING BLOCKS from header and apply to image
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