Accession Number : ADA254410


Title :   SAC Contrail Formation Study


Descriptive Note : Project rept.


Corporate Author : AIR FORCE ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER SCOTT AFB IL


Personal Author(s) : Bjornson, Brian M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254410.pdf


Report Date : May 1992


Pagination or Media Count : 52


Abstract : This report documents the results of a study that compares the Appleman contrail forecasting method used at the Air Force Global Weather Central (AFGWC) with the SAC method using pilot report (PIREP) data collected by SAC/DOW between March 1990 and July 1991. The study resulted in development of two other contrail forecasting techniques. The first (ETACFCST) was developed using discriminant analysis schemes to obtain best fit curves of contrail formation as a function of altitude and temperature, or altitude, temperature, and vertical motion. Statistics showed ETACFCST to be better than either the Appleman or SAC contrail prediction curves. But another technique developed near the end of the study incorporated aircraft engine type as a factor for the first time. The new engine-specific contrail forecasting technique is recommended as a replacement for the Appleman method used at AFGWC.


Descriptors :   *AIRCRAFT DETECTION , *CLIMATOLOGY , *CONDENSATION TRAILS , ALGORITHMS , CLOUDS , WEATHER , OPTICAL DETECTION , AIRCRAFT EXHAUST , STRATEGIC AIR COMMAND , ATMOSPHERIC TEMPERATURE , BAROMETRIC PRESSURE , PREDICTIONS , AIRCRAFT ENGINES , COMPARISON , PILOTS


Subject Categories : Aircraft
      Meteorology
      Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE