In-situ turbulence measurements over a desert basin using a kite/tethered-blimp platform

1999 ◽  
Author(s):  
Frank D. Eaton ◽  
Ben B. Balsley ◽  
Kenneth P. Bishop ◽  
Rod G. Frehlich ◽  
Ronald J. Hugo ◽  
...  
Keyword(s):  
Turbulence Measurements

Obstruction Influence on Low-Speed, In-Situ Stratospheric Turbulence Measurements

2021 ◽  
Author(s):  
Joseph L. Pointer ◽  
Kenneth E. Jansen ◽  
Brian M. Argrow ◽  
Dale A. Lawrence
Keyword(s):  
Turbulence Measurements ◽  
Low Speed

scholarly journals Evaluation of wake influence on high-resolution balloon-sonde measurements

2019 ◽  
Vol 12 (8) ◽  
pp. 4191-4210 ◽  
Author(s):  
Jens Söder ◽  
Michael Gerding ◽  
Andreas Schneider ◽  
Andreas Dörnbrack ◽  
Henrike Wilms ◽  
...  
Keyword(s):  
High Resolution ◽  
Uncertainty Analysis ◽  
Atmospheric Turbulence ◽  
Evaluation Tool ◽  
Turbulence Measurements ◽  
Wake Effects ◽  
Humidity Measurements ◽  
Average Probability ◽  
Vertical Winds

Abstract. Balloons are used for various in situ measurements in the atmosphere. On turbulence measurements from rising balloons there is a potential for misinterpreting wake-created fluctuations in the trail of the balloon for atmospheric turbulence. These wake effects have an influence on temperature and humidity measurements from radiosondes as well. The primary aim of this study is to assess the likelihood for wake encounter on the payload below a rising balloon. Therefore, we present a tool for calculating this probability based on radiosonde wind data. This includes a retrieval of vertical winds from the radiosonde and an uncertainty analysis of the wake assessment. Our wake evaluation tool may be used for any balloon–gondola distance and provides a significant refinement compared to existing assessments. We have analysed wake effects for various balloon–gondola distances applying atmospheric background conditions from a set of 30 radiosondes. For a standard radiosonde we find an average probability for wake encounter of 28 %, pointing out the importance of estimating wake effects on sounding balloons. Furthermore, we find that even millimetre-sized objects in the payload can have significant effects on high-resolution turbulence measurements, if they are located upstream of the turbulence sensor.

scholarly journals Small-scale structures in neutrals and charged aerosol particles as observed during the ECOMA/MASS rocket campaign

2009 ◽  
Vol 27 (4) ◽  
pp. 1449-1456 ◽  
Author(s):  
B. Strelnikov ◽  
M. Rapp ◽  
I. Strelnikova ◽  
N. Engler ◽  
R. Latteck
Keyword(s):  
Doppler Radar ◽  
Companion Paper ◽  
Density Fluctuations ◽  
Lapse Rate ◽  
Small Scale ◽  
Turbulence Energy ◽  
Turbulence Measurements ◽  
Charged Aerosols ◽  
Schmidt Numbers

Abstract. We present results of in situ measurements of neutral temperature during the ECOMA/MASS rocket campaign. We present and compare results of turbulence measurements conducted simultaneously by both in situ and doppler radar techniques. We show that the derived values of the turbulence energy dissipation rates are similar on average. We also find a region with a near adiabatic lapse rate with turbulence detected at the upper and lower edge. We note that it is consistent with expectation for a Kelvin-Helmholtz instability. We also present an estimate of the Schmidt numbers, Sc, for the charged aerosols that utilizes in situ measured small-scale density fluctuations of charged aerosols and both in situ and radar turbulence measurements. The derived Schmidt numbers fall within the range between 100 and 4500. This result agrees with previous estimates based on multi-frequency observations of PMSE (Rapp et al., 2008) and also with estimates of microphysical parameters presented in the companion paper by Rapp et al. (2009).

scholarly journals Evaluation of wake influence on high-resolution balloon-sonde measurements

2019 ◽  
Author(s):  
Jens Söder ◽  
Michael Gerding ◽  
Andreas Schneider ◽  
Andreas Dörnbrack ◽  
Henrike Wilms ◽  
...  
Keyword(s):  
High Resolution ◽  
Uncertainty Analysis ◽  
Atmospheric Turbulence ◽  
Evaluation Tool ◽  
Turbulence Measurements ◽  
Wake Effects ◽  
Humidity Measurements ◽  
Average Probability ◽  
Vertical Winds

Abstract. Balloons are used for various in-situ measurements in the atmosphere. On turbulence measurements from rising balloons there is a potential for misinterpreting wake-created fluctuations in the trail of the balloon for atmospheric turbulence. These wake effects have an influence on temperature and humidity measurements from radiosondes as well. The primary aim of this study is to assess the likelihood for wake encounter on the payload below a rising balloon. Therefore, we present a tool for calculating this probability based on radiosonde wind data. This includes a retrieval of vertical winds from the radiosonde and an uncertainty analysis of the wake assessment. Our wake evaluation tool may be used for any balloon-gondola distance and provides a significant refinement compared to existing assessments. We have analysed wake effects for various balloon-gondola distances applying atmospheric background conditions from a set of 30 radiosondes. For a standard radiosonde we find an average probability for wake encounter of 28 %, pointing out the importance of estimating wake effects on sounding balloons. Furthermore, we find that even millimetre sized objects in the payload can have significant effects on high-resolution turbulence measurements, if they are located upstream of the turbulence sensor.

A Low-Cost Balloon System for High-Cadence, In-Situ Stratospheric Turbulence Measurements

2021 ◽  
Author(s):  
Christopher A. Roseman ◽  
Dale A. Lawrence ◽  
Joseph L. Pointer ◽  
Steve Borenstein ◽  
Brian M. Argrow
Keyword(s):  
Low Cost ◽  
Turbulence Measurements ◽  
High Cadence ◽  
Balloon System

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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