Sonde Experiments For Comparative Measurements Of Optical Turbulence
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Author | : J. H. Brown |
Publisher | : |
Total Pages | : 52 |
Release | : 1982 |
Genre | : Atmospheric temperature |
ISBN | : |
Download Sonde Experiments for Comparative Measurements of Optical Turbulence Book in PDF, Epub and Kindle
Five different instruments were used in multiple experiments to measure atmospheric turbulence in the form of the refractive structure constant, C sub n squared. These included UHF radar, optical scintillometer, modified radiosondes, AFGL thermosondes, and aircraft micro-thermal measurements. Described here are the radiosonde and thermosonde electronics and their calibrations. The data reduction scheme is described and a brief program description is given. Although the different instruments gave measurements somewhat separated in space and time, first results show good agreement between the radar, scintillometer, and thermosonde measurements.
Author | : J. H. Brown |
Publisher | : |
Total Pages | : 52 |
Release | : 1982 |
Genre | : Atmospheric temperature |
ISBN | : |
Download Sonde Experiments for Comparative Measurements of Optical Turbulence Book in PDF, Epub and Kindle
Five different instruments were used in multiple experiments to measure atmospheric turbulence in the form of the refractive structure constant, C sub n squared. These included UHF radar, optical scintillometer, modified radiosondes, AFGL thermosondes, and aircraft micro-thermal measurements. Described here are the radiosonde and thermosonde electronics and their calibrations. The data reduction scheme is described and a brief program description is given. Although the different instruments gave measurements somewhat separated in space and time, first results show good agreement between the radar, scintillometer, and thermosonde measurements.
Author | : James H. Brown |
Publisher | : |
Total Pages | : 78 |
Release | : 1989 |
Genre | : Astronomical instruments |
ISBN | : |
Download Study of Possible Solar Heating Effects on Thermosonde Probes Book in PDF, Epub and Kindle
Thermosonde data reveals a diurnal daytime shift in measured levels of C square (n) in the free atmosphere. The shift is manifested in two ways. First, an apparent offset in the smallest measured values of C square (n) exists. Secondly, the curve of the average profile shows an enhancement over nighttime profiles. Related optical and radar measurements have indicated that differences between day and night probably exist, but because of limited instrumental resolution and altitude capabilities those results are inconclusive. Several hypotheses have been put forward in this paper concerning possible instrumental or solar based sources of data contamination. We have examined the possibility that solar radiation causes probe heating with subsequent instrumental effects. Calculation, computer simulation, and direct measurements have shown that the sun heats the body of the probe sensor a couple of degrees above the ambient and that the level of heating depends upon the solar aspect angle and magnitude and direction of air flow over the probe. A small but insignificant AC type effect can result from improper probe geometry or probe mismatch together with a coupling of solar heating with velocity turbulence. Transient and DC type effects can occur, but measured, processed, and transmitted root mean square C square (n) information is not likely to contain instrumental contamination.
Author | : |
Publisher | : |
Total Pages | : 772 |
Release | : 1994 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, Epub and Kindle
Author | : S. A. Bowhill |
Publisher | : |
Total Pages | : 522 |
Release | : 1986 |
Genre | : Atmosphere |
ISBN | : |
Download Middle Atmosphere Program Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 746 |
Release | : 1981 |
Genre | : Air |
ISBN | : |
Download Middle Atmosphere Program Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 524 |
Release | : 1981 |
Genre | : Air |
ISBN | : |
Download Middle Atmosphere Program: Papers presented at the URSI Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 216 |
Release | : 1982 |
Genre | : Science |
ISBN | : |
Download Technical Abstract Bulletin Book in PDF, Epub and Kindle
Author | : James H. Brown |
Publisher | : |
Total Pages | : 62 |
Release | : 1984 |
Genre | : Atmospheric turbulence |
ISBN | : |
Download Thermosonde and UHF Radar Measurements of C2n at Westford, Massachusetts -- July 1981 Book in PDF, Epub and Kindle
Five different instruments were used in coordinated multiple experiments to measure atmospheric turbulence. C sub n squared, the optical refractive structure constant, was measured by thermosondes, UHF radar, stellar scintillometer, and aircraft mounted micro-thermal probes. Presented here are the results of 19 rawinsode flights. Also comparisons of eight thermosonde/radar profiles, one radar, scintillometer, thermosonode profile, and several aircraft profiles are presented. For the scales discussed here, good agreement is shown between radar, thermosonode, and scintillometer data. Worse agreement is obtained from aircraft measurements. A diurnal shift in the C2 profile is noted but no tropopause enhancement is found.
Author | : James H. Brown |
Publisher | : |
Total Pages | : 74 |
Release | : 1993 |
Genre | : Atmospheric turbulence |
ISBN | : |
Download A Nighttime Structure Model of Atmospheric Optical Turbulence, C2[n Subscript], Derived from Thermosonde and High Resolution Rawinsonde Measurements Book in PDF, Epub and Kindle