Accession Number : AD0662606

Title :   LOW-LATITUDE NIGHTGLOW ARCS,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Elliott,D. D. ; LaValle,S. R.

Report Date : OCT 1967

Pagination or Media Count : 17

Abstract : The equatorial region has been surveyed repeatedly for nightglow arcs from a polar-orbiting satellite. The measurements were made at 5577A and 6300A from December 1966 through March 1967, at a local time near midnight. Of the 13 orbits analyzed in detail, there were red (6300A) arcs every night and green (5577A) arcs 9 times out of the 13. The red arcs had a median magnitude of about 150 Rayleighs and occurred predominantly in pairs spaced symmetrically around the magnetic equator (Barbier's tropical red arcs). The green arcs, which had a median magnitude of about 100 Rayleighs and appeared in pairs about half of the time, frequently occurred in coincidence with the red arcs. The red and the green arcs typically occurred at plus or minus 15 degrees magnetic latitude and were about 10 degrees wide. The arcs were not dependent on the planetary magnetic index K sub p. (Author)

Descriptors :   (*AIRGLOW, NIGHT SKY), (*TROPICAL REGIONS, AIRGLOW), ORBITS, SKY BRIGHTNESS, SCIENTIFIC SATELLITES, PHOTOMETERS, CHARGED PARTICLES, ELECTRONS, LINE SPECTRA

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE