Study Of Possible Solar Heating Effects On Thermosonde Probes
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Study Of Possible Solar Heating Effects On Thermosonde Probes
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Author : James H. Brown
language : en
Publisher:
Release Date : 1989
Study Of Possible Solar Heating Effects On Thermosonde Probes written by James H. Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Astronomical instruments categories.
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.
Study Of Possible Solar Heating Effects On Thermosonde Probes
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Author :
language : en
Publisher:
Release Date : 1989
Study Of Possible Solar Heating Effects On Thermosonde Probes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Radiosondes categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1990
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Power resources categories.
Environmental Research Papers
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Author :
language : en
Publisher:
Release Date :
Environmental Research Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Environmental geology categories.
An Investigation Of The Causes Of Optical And Infrared Airglow Structures In The Mesosphere
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Author : Edmond M. Dewan
language : en
Publisher:
Release Date : 1994
An Investigation Of The Causes Of Optical And Infrared Airglow Structures In The Mesosphere written by Edmond M. Dewan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Airglow categories.
A Model For C2n Optical Turbulence Profiles Using Radiosonde Data
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Author : Edmond M. Dewan
language : en
Publisher:
Release Date : 1993
A Model For C2n Optical Turbulence Profiles Using Radiosonde Data written by Edmond M. Dewan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Atmospheric turbulence categories.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1993
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Science categories.
Solar Heating Effects On Balloon Borne Microthermal Probes For The Airborne Laser Program
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Author : Daniel J. Richardson
language : en
Publisher:
Release Date : 1997-06-01
Solar Heating Effects On Balloon Borne Microthermal Probes For The Airborne Laser Program written by Daniel J. Richardson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-06-01 with categories.
Atmospheric optical turbulence induces phase fluctuations in a propagating electromagnetic wave. The resulting degradation in coherence limits the capability of any laser, target acquisition, or surveillance system. Past data collection methods for the parameterization of atmospheric turbulence profiles, in support of critical Theater Ballistic Missile Defense (TBM) systems, from ground level to 30 km, have depended on meteorological balloon- thermosonde systems, probes carried on the U.S. Air Force Argus aircraft, as well as radar and optical measurements. The balloon and aircraft systems measure temperature fluctuations and compute the temperature structure function, CT2 and the related index of refraction structure parameter, Cn2. It has recently become critical to explain why turbulence profiles from daytime thermosonde data consistently show a two order of magnitude increase over that taken during the night, primarily between 12-20 km. This thesis analyzed the TSI 3.8 micron platinum coated tungsten thermosonde probe used by the USAF Research Laboratory (AFRL) to quantity the magnitude of the solar heating and to investigate other heat transfer mechanisms in the probe. A model of the thin wire probe was developed to identity each of the contributions to the temperature error and its significance. Experimental measurements where collected to verify most aspects of the final model. We found that the sun induces a temperature rise in the TSI 3.8 micron fine wire probe, during the day, that can vary from near zero to 0. 175 K. It is strongly dependent on probe orientation with respect to the sun and on variations in the air flow over the probe. This then causes an apparent increase by two orders of magnitude in the daytime measurements of the optical turbulence parameters CT2 and Cn2.
A Study Of Radar Aspect Sensitivity In The Lower Atmosphere
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Author : Charlie Yann-Ting Chen
language : en
Publisher:
Release Date : 2001
A Study Of Radar Aspect Sensitivity In The Lower Atmosphere written by Charlie Yann-Ting Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.