Airborne measurement of tropopausal temperature fluctuations

Masson, Bruce S.; Afb, Kirtland; Scruggs, B.; Hayes, Michael S.; Wissler, John; Bishop, Kenneth P.; Kyrazis, Demos T.

doi:10.2514/6.1996-265

Cited by 5 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The N in Eqs. (2)(3)(4) represents the number of data points used to compute the FFT and 1t the time interval between consecutive data points. The results of this calculation are shown in Fig.…”

Section: Constant-mach-number Flight Testsmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic Noise-Source Identification in Aircraft-Based Atmospheric Temperature Measurements

et al. 2002

View full text Add to dashboard Cite

Atmospheric temperature uctuation data collected from a Grumman Gulfstream II aircraft show features in temperature power spectral density functions that do not follow the expected ¡ 5 3 slope for homogeneous isotropic turbulence. Spectral analysis techniques show that these features result from the upstream propagation of a nondispersive acoustical wave. The source of the acoustical wave, which appears only at ight altitudes greater than 28,000 ft (8530 m), is attributed to engine acoustics in the form of jet screech where vortical structures interact with a quasi-periodic shock cell structure, both in the jet exhaust. The nature of the acoustical disturbance is shown to be dependent on velocity, with increased velocity resulting in a decrease in jet-screech peak frequency. These results are found to be consistent with those of other researchers investigating jet screech in jet ows.

show abstract

Section: Constant-mach-number Flight Testsmentioning

confidence: 99%

“…These low signal levels have led to the development of a high-gain/low-electronicnoise constant current anemometer system. 3 The normal constant current anemometer sensor suite (described in Ref. 3) was augmented while the experiments presented here were performed and will be described in the following subsections.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Acoustic Noise-Source Identification in Aircraft-Based Atmospheric Temperature Measurements

et al. 2002

View full text Add to dashboard Cite

show abstract

“…High-resolution temperature for deriving the turbulence structure parameters of temperature and refractive index has been measured by the USAF to assess the optical turbulence properties of the atmosphere for several years, with particular attention paid to the turbulence found in the upper troposphere and the stratosphere (Masson et al, 1996). Measurements have been taken with a sampling rate of 12 kHz using a C-135E or Gulfstream II aircraft flying at about 220 m s −1 .…”

Section: Sensorsmentioning

confidence: 99%

Fine-Scale Measurements Of Turbulence In The Lower Troposphere: An Intercomparison Between A Kite- And Balloon-Borne, And A Helicopter-Borne Measurement System

Muschinski

Frehich

Jensen

et al. 2001

Boundary-Layer Meteorology

View full text Add to dashboard Cite

show abstract

“…There has been a great deal of work done on understanding how molecules, aerosols, water vapor, cloud droplets, precipitation drops (Weichel 1989, and Stephens 1994) and optical turbulence (Masson et al 1996, Eaton et al 1998, and Hahn et al 1999 interact with a laser beam. Optical turbulence is a difficulty to overcome but is still being researched.…”

Section: Motivationmentioning

confidence: 99%

<title>Laser transmission through simulated cirrus clouds</title>

2001

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, oatherina and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collectior of information, including suqqestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports ^7045)188)7 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.REPORT DATE (DD-MM-YYYY) LASER TRANSMISSION THROUGH SIMULATED CIRRUS CLOUDS AUTHOR(S)CAPT KOLB ILA L DATES COVERED (From -To)5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)COLORADO STATE UNIVERSITY SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) ABSTRACT OF THESIS LASER TRANSMISSION THROUGH SIMULATED CIRRUS CLOUDSSince approximately 20% of the globe is covered with cirrus clouds at any given time, it is clear that any airborne or spaceborne system using a laser will intercept cirrus clouds at some point. Cirrus clouds contain a very complex microphysical structure that will affect laser power by scattering and reflecting it away from the intended target, thus reducing efficiency and possibly even making it ineffective.Using two thin cirrus laser transmission models, a single homogeneous cloud layer model and a multiple cloud layer model, laser transmission profiles are generated from a simulated cirrus cloud case created by the RAMS model.Sensitivity studies are performed on the laser transmission model to examine the effects of aerosols and water vapor, ice crystal orientation, multiple scattering contributions, and the differences between the single and multiple layer models. ABSTRACT OF THESIS LASER TRANSMISSION THROUGH SIMULATED CIRRUS CLOUDSSince approximately 20% of the globe is covered with cirrus clouds at any given time, it is clear that any airborne or spaceborne system using a laser will intercept cirrus clouds at some point. Cirrus clouds contain a very complex microphysical structure that will affect laser power by scattering and reflecting it away from the intended target, thus reducing efficiency and possibly even making it ineffective.Using two thin cirrus laser transmission models, a single homogeneous cloud layer

show abstract

Airborne measurement of tropopausal temperature fluctuations

Cited by 5 publications

References 19 publications

Acoustic Noise-Source Identification in Aircraft-Based Atmospheric Temperature Measurements

Acoustic Noise-Source Identification in Aircraft-Based Atmospheric Temperature Measurements

Fine-Scale Measurements Of Turbulence In The Lower Troposphere: An Intercomparison Between A Kite- And Balloon-Borne, And A Helicopter-Borne Measurement System

<title>Laser transmission through simulated cirrus clouds</title>

Contact Info

Product

Resources

About