Suggested outline for SPIE 2015 paper on commercial aircraft impact on LSST and other all-sky surveys

  • Introduction
    • three mechanisms for photometric impact of aircraft: 
    1. obscuration - transit time is 30 meters / 200 meters/sec ~ 0.15 sec so photometric impact is 1% * (15 sec/t_exposure). 
    2. lights-  make streaks that are easy to detect, esp in difference images. Need aircraft/satellite detector for streaked sources
    3. contrails- sometimes they form, and sometimes they don't. Also, both persistence and optical depth vary depending on atmospheric conditions. 
    • contrail formation
    • aircraft detection via ADS-B transponders
    • brief summary of ADS-B and adoption timeframe
    • All-sky surveys have the luxury of avoiding contrails and aircraft. The trick is 1) knowing where they are, and 2) knowing when we need to avoid contrails. 
  • Air Traffic Above Cerro Pacho, the LSST site, detected via ADS-B. 
    • summary statistics and tracks for air traffic above Pachon
      1. how many times does an aircraft transit across (i.e. appear in) an image? 
      2. If we make a worst-case assumption about contrails (100% formation and total persistence) how often does one land in an image? (this one is real work).  
  • Contrail formation above Cerro Pachon, through daytime images. 
      1. examples of contrail images
      2. ADS-B triggered images
  • Upper atmosphere statistics (from Antofagasta and Santo Domingo)
        1. summary data from Wyoming web site. 
  • Conclusions and next steps

 

 

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