Accession Number : AD0813560

Title :   OPTICAL EFFECTS OF NEAR-GROUND TURBULENCE AT THE VAN NORMAN LAKE SOLAR OBSERVATORY SITE.

Descriptive Note : Rept. for Dec 65-Jan 67,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA LABS DIV

Personal Author(s) : Berry, G. V. ; Ward, R. C.

Report Date : FEB 1967

Pagination or Media Count : 37

Abstract : The distortion of light wavefronts by atmospheric turbulence in the first 15 m above ground was measured at a solar observatory site near Sylmar, California. It is inferred from these data that seldom if ever should near-ground turbulence significantly degrade the resolution of a solar telescope to be installed at this site. Comparison of the measured values of near-ground turbulence with simultaneous estimates of solar 'seeing' quality showed essentially no correlation between the two variables. The instrument used to measure wavefront distortion, a 'differential-interferometer seeing meter' being developed in these laboratories, is described.

Descriptors :   (*LIGHT TRANSMISSION, TURBULENCE), (*ATMOSPHERIC MOTION, OPTICAL PROPERTIES), ASTRONOMICAL OBSERVATORIES, CALIFORNIA, MEASUREMENT, RESOLUTION, PROPAGATION, ELECTROMAGNETIC RADIATION, TELESCOPES, DISTORTION, WAVE PROPAGATION, VISIBILITY, DIURNAL VARIATIONS, INTERFEROMETERS, LOW ALTITUDE.

Subject Categories : Astronomy
      Atmospheric Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE