Accession Number : ADA115210

Title :   EXCEDE Support Studies.

Descriptive Note : Final rept. 15 May 80-15 Sep 81,

Corporate Author : AERODYNE RESEARCH INC BEDFORD MA

Personal Author(s) : Zahniser,Mark S ; Cheng,Wai ; Bien,Fritz ; Lyons,Robert

PDF Url : ADA115210

Report Date : 15 Sep 1981

Pagination or Media Count : 74

Abstract : Various aspects relating to the EXCEDE artificial aurora project are discussed: (1) Data from EXCEDE SPECTRAL in the 4.5 to 5 micrometers region taken by infrared circular variable filters is analyzed for emission from CO, N2O, and NO+. The spectral band profile and altitude dependence of the 4.5 micrometers feature correlates with a model for NO+ chemiluminescent emission. (2) A preliminary analysis of spectra in the 12 to 22 micrometers region shows CO2 V sub 2 radiation at 15 micrometers to be the predominant feature. Altitude profiles for peaks at 14 and 16 micrometers are presented. (3) The flowfield for the hypersonic wake of the EXCEDE vehicle at lower altitudes is characterized. Intensity patterns in photographs taken with the on-board visible camera are explained in terms of bow shock and wake shock formation and a procedure is outlined for analyzing the radiometric data in terms of this effect. (4) The long lived electron beam-induced chemiluminescent trail of the Precede I experiment recorded from ground based photography has been analyzed for intensity and altitude distribution. The air afterglow reaction NO + O yields NO2 + hv, from beam-produced NO and ambient atomic oxygen, is not sufficiently strong to account for the observed 10 k Rayleigh intensity. (Author)

Descriptors :   *AURORAE, *CHEMILUMINESCENCE, *INDUCED ENVIRONMENTS, *BAND SPECTRA, SIMULATION, GROUND LEVEL, INTENSITY, PATTERNS, ELECTRONS, LOW ALTITUDE, RADIOMETRY, CAMERAS, PHOTOGRAPHY, PROFILES, EMISSION SPECTRA, INFRARED FILTERS

Subject Categories : Atmospheric Physics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE