Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations

2020 ◽  
Vol 125 (7) ◽  
Author(s):  
Chen Zeng ◽  
Chi Wang ◽  
Suping Duan ◽  
Lei Dai ◽  
S. A. Fuselier ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Spatial Distribution ◽  
Statistical Study ◽  
Oxygen Ions ◽  
Dayside Magnetopause

A Statistical Study of Process Variables to Optimize a High Speed Curtain Coater: Part I

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 20-26 ◽  
Author(s):  
PEEYUSH TRIPATHI ◽  
MARGARET JOYCE ◽  
PAUL D. FLEMING ◽  
MASAHIRO SUGIHARA
Keyword(s):  
Boundary Layer ◽  
Experimental Design ◽  
High Speed ◽  
Statistical Study ◽  
Process Variables ◽  
High Speeds ◽  
The Stability ◽  
Air Removal ◽  
Removal System

Using an experimental design approach, researchers altered process parameters and material prop-erties to stabilize the curtain of a pilot curtain coater at high speeds. Part I of this paper identifies the four significant variables that influence curtain stability. The boundary layer air removal system was critical to the stability of the curtain and base sheet roughness was found to be very important. A shear thinning coating rheology and higher curtain heights improved the curtain stability at high speeds. The sizing of the base sheet affected coverage and cur-tain stability because of its effect on base sheet wettability. The role of surfactant was inconclusive. Part II of this paper will report on further optimization of curtain stability with these four variables using a D-optimal partial-facto-rial design.

A statistical study of accelerated flow events at the dayside magnetopause

1994 ◽  
Vol 99 (A8) ◽  
pp. 14815 ◽  
Author(s):  
L. Scurry ◽  
C. T. Russell ◽  
J. T. Gosling
Keyword(s):  
Statistical Study ◽  
Dayside Magnetopause ◽  
Accelerated Flow

scholarly journals Set of Algorithms and Techniques for Accurate 3D, Single Beam – Single Pointing, Lidar Measurements for Slant Range Visibility, Planetary Boundary Layer Height and Wind Speed Retrieval, Atmospheric Layers Spatial Distribution and Categorization in Real Time

2020 ◽  
Vol 237 ◽  
pp. 02031
Author(s):  
Alexandros Pantazis ◽  
Alexandros Papayannis
Keyword(s):  
Boundary Layer ◽  
Spatial Distribution ◽  
Wind Speed ◽  
Real Time ◽  
Planetary Boundary Layer ◽  
Planetary Boundary Layer Height ◽  
Layer Height ◽  
Single Beam ◽  
Slant Range ◽  
Boundary Layer Height

In this work, a full set of recently developed algorithms and techniques is presented, for a single beam-single pointing lidar to be able to perform operational and independent accurate 3 Dimensional (3D) measurements, for slant range visibility, wind speed retrieval, atmospheric layers spatial distribution and categorization, as well as Planetary Boundary Layer Height (PBLH) retrieval, in real or Near Real Time (NRT).The idea behind this development was for any single lidar to be able to perform a set of accurately measured products, either mobile or stationary, with or without network connectivity with other sensors for data-information exchange. The products were determined by the needs of lidar remote scientific and commercial community, in order to be even more attractive and valuable to atmospheric scientists, meteorologists, aviation and shipping safety operators, as well as to the Space lidar community.

scholarly journals Statistics of the Intense Current Structure in the Dayside Magnetopause Boundary Layer

2021 ◽  
Author(s):  
Hengyan Man ◽  
Meng Zhou ◽  
Zhihong Zhong ◽  
Xiaohua Deng ◽  
Haimeng Li
Keyword(s):  
Boundary Layer ◽  
Current Structure ◽  
Dayside Magnetopause

scholarly journals Distributed wind measurements with multiple quadrotor unmanned aerial vehicles in the atmospheric boundary layer

2021 ◽  
Vol 14 (5) ◽  
pp. 3795-3814
Author(s):  
Tamino Wetz ◽  
Norman Wildmann ◽  
Frank Beyrich
Keyword(s):  
Boundary Layer ◽  
Spatial Distribution ◽  
Wind Speed ◽  
Atmospheric Boundary Layer ◽  
Unmanned Aerial Vehicles ◽  
Horizontal Wind ◽  
Vertical Profiles ◽  
Aerial Vehicles ◽  
Wind Measurements ◽  
Quadrotor Unmanned Aerial Vehicles

Abstract. In this study, a fleet of quadrotor unmanned aerial vehicles (UAVs) is presented as a system to measure the spatial distribution of atmospheric boundary layer flow. The big advantage of this approach is that multiple and flexible measurement points in space can be sampled synchronously. The algorithm to obtain horizontal wind speed and direction is designed for hovering flight phases and is based on the principle of aerodynamic drag and the related quadrotor dynamics. During the FESST@MOL campaign at the boundary layer field site (Grenzschichtmessfeld, GM) Falkenberg of the Lindenberg Meteorological Observatory – Richard Assmann Observatory (MOL-RAO), 76 calibration and validation flights were performed. The 99 m tower equipped with cup and sonic anemometers at the site is used as the reference for the calibration of the wind measurements. The validation with an independent dataset against the tower anemometers reveals that an average accuracy of σrms<0.3 m s−1 for the wind speed and σrms,ψ<8∘ for the wind direction was achieved. Furthermore, we compare the spatial distribution of wind measurements with the fleet of quadrotors to the tower vertical profiles and Doppler wind lidar scans. We show that the observed shear in the vertical profiles matches well with the tower and the fluctuations on short timescales agree between the systems. Flow structures that appear in the time series of a line-of-sight measurement and a two-dimensional vertical scan of the lidar can be observed with the fleet of quadrotors and are even sampled with a higher resolution than the deployed lidar can provide.

Distributed wind measurements with multiple quadrotor UAVs in the atmospheric boundary layer

2021 ◽  
Author(s):  
Tamino Wetz ◽  
Norman Wildmann ◽  
Frank Beyrich
Keyword(s):  
Boundary Layer ◽  
Spatial Distribution ◽  
Wind Speed ◽  
Atmospheric Boundary Layer ◽  
Horizontal Wind ◽  
Vertical Profiles ◽  
Sonic Anemometers ◽  
Meteorological Observatory ◽  
Wind Measurements ◽  
Quadrotor Uavs

&lt;p&gt;A swarm of quadrotor UAVs is presented as a system to measure the spatial distribution of atmospheric boundary layer flow. The big advantage of this approach is, that multiple and flexible measurement points in space can be sampled synchronously. The algorithm to obtain horizontal wind speed and direction is designed for hovering flight phases and is based on the principle of aerodynamic drag and the related quadrotor dynamics using only on-board sensors.&lt;/p&gt;&lt;p&gt;During the FESST@MOL campaign at the Boundary Layer Field Site (Grenzschichtmessfeld, GM) Falkenberg of the Lindenberg Meteorological Observatory - Richard-A&amp;#223;mann-Observatory (MOL-RAO), 76 calibration and validation flights were performed. The 99 m tower equipped with cup and sonic anemometers at the site is used as the reference for the calibration of the wind measurements. The validation with an independent dataset against the tower anemometers reveals that an average accuracy of &amp;#963;&lt;sub&gt;rms &lt;/sub&gt;&lt; 0.3 m s&lt;sup&gt;-1&lt;/sup&gt; for the wind speed and &amp;#963;&lt;sub&gt;rms&lt;/sub&gt;,&lt;sub&gt;&amp;#936;&lt;/sub&gt;&lt;sub&gt;&lt;/sub&gt;&lt; 8&amp;#176; for the wind direction was achieved.&lt;/p&gt;&lt;p&gt;Furthermore, we compare the spatial distribution of wind measurements with the swarm to the tower vertical profiles and Doppler wind lidar scans. We show that the observed shear in the vertical profiles matches well with the tower and the fluctuations on short time scales agree between the systems. Flow structures that appear in the time series of a line-of-sight measurement and a two-dimensional vertical scan of the lidar can be observed with the swarm and are even sampled with a higher resolution than the deployed lidar can provide.&lt;/p&gt;&lt;p&gt;In addition to the intercomparison of the mean wind velocity measurements, turbulence data of the UAV-swarm measurements are analyzed and a comparison to sonic anemometer measurements is provided.&lt;/p&gt;

scholarly journals A statistical study of plasmaspheric plumes and ionospheric outflows observed at the dayside magnetopause

2016 ◽  
Vol 121 (1) ◽  
pp. 492-506 ◽  
Author(s):  
S. H. Lee ◽  
H. Zhang ◽  
Q.‐G. Zong ◽  
A. Otto ◽  
H. Rème ◽  
...  
Keyword(s):  
Statistical Study ◽  
Dayside Magnetopause
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