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:
- obscuration - transit time is 30 meters / 200 meters/sec ~ 0.15 sec so photometric impact is 1% * (15 sec/t_exposure).
- lights- make streaks that are easy to detect, esp in difference images. Need aircraft/satellite detector for streaked sources
- 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
- how many times does an aircraft transit across (i.e. appear in) an image?
- 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.
- examples of contrail images
- ADS-B triggered images
- Upper atmosphere statistics (from Antofagasta and Santo Domingo)
- summary data from Wyoming web site.
- Conclusions and next steps