scholarly journals Statistical survey of day-side magnetospheric current flow using Cluster observations: Bow shock

2018 ◽  
Author(s):  
Evelyn Liebert ◽  
Christian Nabert ◽  
Karl-Heinz Glassmeier
Keyword(s):  
Current Flow ◽  
Current System ◽  
Bow Shock ◽  
Fluxgate Magnetometer ◽  
Good Accordance ◽  
Magnetometer Data ◽  
Current Densities ◽  
Simulation Results ◽  
Statistical Survey

Abstract. We present the first comprehensive statistical survey of the day-side terrestrial bow shock current system based on a large number of Cluster spacecraft bow shock crossings. Calculating the 3-D current densities using Fluxgate Magnetometer data and the Curlometer technique enables the investigation of current locations, directions and magnitudes in dependence on arbitrary IMF orientation. In case of quasi-perpendicular shock geometries we find that the current properties are in good accordance to theory and existing simulation results. However, currents at quasi-parallel shock geometries next to the foreshock region underlie distinct variations regarding their directions.

scholarly journals Statistical survey of day-side magnetospheric current flow using Cluster observations: bow shock

2018 ◽  
Vol 36 (4) ◽  
pp. 1073-1080 ◽  
Author(s):  
Evelyn Liebert ◽  
Christian Nabert ◽  
Karl-Heinz Glassmeier
Keyword(s):  
Current Flow ◽  
Current System ◽  
Bow Shock ◽  
Fluxgate Magnetometer ◽  
Good Accordance ◽  
Magnetometer Data ◽  
Current Densities ◽  
Simulation Results ◽  
Statistical Survey

Abstract. We present the first comprehensive statistical survey of the day-side terrestrial bow shock current system based on a large number of Cluster spacecraft bow shock crossings. Calculating the 3-D current densities using fluxgate magnetometer data and the curlometer technique enables the investigation of current locations, directions, and magnitudes in dependence on arbitrary IMF orientation. In case of quasi-perpendicular shock geometries we find that the current properties are in good accordance with theory and existing simulation results. However, currents at quasi-parallel shock geometries next to the foreshock region underlie distinct variations regarding their directions.

scholarly journals Statistical survey of day-side magnetospheric current flow using Cluster observations: magnetopause

2017 ◽  
Vol 35 (3) ◽  
pp. 645-657 ◽  
Author(s):  
Evelyn Liebert ◽  
Christian Nabert ◽  
Christopher Perschke ◽  
Karl-Heinz Fornaçon ◽  
Karl-Heinz Glassmeier
Keyword(s):  
Solar Wind ◽  
High Latitude ◽  
Current Flow ◽  
Fluxgate Magnetometer ◽  
Current Direction ◽  
Plasma Properties ◽  
Close Vicinity ◽  
Magnetometer Data ◽  
Current Densities ◽  
Statistical Survey

Abstract. We present a statistical survey of current structures observed by the Cluster spacecraft at high-latitude day-side magnetopause encounters in the close vicinity of the polar cusps. Making use of the curlometer technique and the fluxgate magnetometer data, we calculate the 3-D current densities and investigate the magnetopause current direction, location, and magnitude during varying solar wind conditions. We find that the orientation of the day-side current structures is in accordance with existing magnetopause current models. Based on the ambient plasma properties, we distinguish five different transition regions at the magnetopause surface and observe distinctive current properties for each region. Additionally, we find that the location of currents varies with respect to the onset of the changes in the plasma environment during magnetopause crossings.

scholarly journals The fluxgate magnetometer of the Low Orbit Pearl Satellites (LOPS): overview of in-flight performance and initial results

2021 ◽  
Vol 10 (2) ◽  
pp. 227-243
Author(s):  
Ye Zhu ◽  
Aimin Du ◽  
Hao Luo ◽  
Donghai Qiao ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Current System ◽  
Field Measurements ◽  
Stray Field ◽  
Fluxgate Magnetometer ◽  
General Description ◽  
Flight Performance ◽  
Spatial Coverage ◽  
Magnetic Field Measurements ◽  
Initial Results

Abstract. The Low Orbit Pearl Satellite series consists of six constellations, with each constellation consisting of three identical microsatellites that line up just like a string of pearls. The first constellation of three satellites were launched on 29 September 2017, with an inclination of ∼ 35.5∘ and ∼ 600 km altitude. Each satellite is equipped with three identical fluxgate magnetometers that measure the in situ magnetic field and its low-frequency fluctuations in the Earth's low-altitude orbit. The triple sensor configuration enables separation of stray field effects generated by the spacecraft from the ambient magnetic field (e.g., Zhang et al., 2006). This paper gives a general description of the magnetometer including the instrument design, calibration before launch, in-flight calibration, in-flight performance, and initial results. Unprecedented spatial coverage resolution of the magnetic field measurements allow for the investigation of the dynamic processes and electric currents of the ionosphere and magnetosphere, especially for the ring current and equatorial electrojet during both quiet geomagnetic conditions and storms. Magnetic field measurements from LOPS could be important for studying the method to separate their contributions of the Magnetosphere-Ionosphere (M-I) current system.

scholarly journals Sales Analysis Using the Forecasting Method

bit-Tech ◽  
2019 ◽  
Vol 1 (3) ◽  
pp. 146-149
Author(s):  
Amesanggeng Pataropura ◽  
Riki Riki ◽  
Ariadi Saputra
Keyword(s):  
Current Flow ◽  
Current System ◽  
Moving Average ◽  
Scientific Work ◽  
Transaction Data ◽  
Forecasting Method ◽  
Effectiveness And Efficiency ◽  
To Come ◽  
New System ◽  
Weighted Moving Average

Sales Analysis Using Forecasting Method aims to improve effectiveness and efficiency that facilitates companies in business transaction processes, improve the delivery of information quickly, accurately, and transaction data well and minimize errors. The method used in the presentation of this scientific work is by using a forecasting method which helps determine the approximate stock of goods to come. With 3 forecasting modules are: Moving Average, Weighted Moving Average, Trend Projection is used to perform the forecasting process of the upcoming stock of goods. Can solve problems that exist in the current system so that it can help in improving its services by calculating the stock and helping by determining the average data that has been linked to the forecasting module whose results can be concluded through reports per period. It can be concluded that the results of implementing this new system can help companies in recording each transaction that occurs becomes more efficient and effective, so that it can overcome the problems that exist in the current system. With this we can predict the current flow of goods that have been calculated based on 3 (three) modules that have connections with the system

Electrode conduction processes in air plasmas

1962 ◽  
Vol 13 (3) ◽  
pp. 465-477 ◽  
Author(s):  
D. W. George ◽  
H. K. Messerle
Keyword(s):  
Magnetic Field ◽  
Shock Tube ◽  
Current Flow ◽  
Electronic Conductivity ◽  
The Other ◽  
High Current ◽  
Air Plasma ◽  
Air Plasmas ◽  
Current Densities

Using an electrically driven shock tube with initial pressures of 0.1 to 1.0 mm Hg and shock speeds of about Mach 12 to 15, the resistance of an air plasma between two parallel probes has been measured by two different techniques and the results compared. In one, external voltages of from 0 to 100 V were applied to the probes and in the other, electromagnetically induced voltages of from 0 to 25 V were produced by the plasma's motion in a magnetic field of up to 3500 G. In either case the resistance was found to decrease as the current flow increased and was consistent with the equilibrium electronic conductivity of the air plasma at high current densities.

Bow Shock Effect on Particle Transport and Deposition in a Hypersonic Impactor

2003 ◽  
Author(s):  
Omid Abouali ◽  
Goodarz Ahmadi
Keyword(s):  
Computer Simulation ◽  
Flow Field ◽  
Particle Transport ◽  
Operating Conditions ◽  
Bow Shock ◽  
Nano Particles ◽  
Correction Coefficient ◽  
Navier Stokes Equation ◽  
Micro Particles ◽  
Simulation Results

Supersonic/hypersonic impactors are used as a collector and/or size separator of nano- and micro-particles. Thin film and fine line pattern deposition by aerosol jets are other applications of deposition of supersonic/hypersonic impactors. At extremely low backpressures, the exiting flow from a nozzle forms a supersonic free jet. The supersonic jet forms a strong normal shock in the front of the impactor plate. The stagnation pressure, backpressure and distance between the nozzle exit and the impactor plate affect the flow field. Due to the rather complicated flow in the impactor, studies of particle motions in supersonic impactors are rather scarce. In this study the airflow and particle transport and deposition in a supersonic/hypersonic impactor are numerically simulated. The axisymmetric compressible Navier-Stokes equation is solved and the flow properties are evaluated. It is assumed that the particle concentration is dilute, to the extent that the presence of particles does not alter the flow field. Deposition of different size particles under different operating conditions is studied. The importance of drag, lift and Brownian forces on particle motions in supersonic impactors is discussed. Sensitivity of the simulation results to the use of different expressions for the drag force is also examined. A strong bow shock on the flowfield has much effect in drag forces on particles. It is shown that the Stokes-Cunningham drag with variable correction coefficient is most suitable for computer simulation studies of nano-particles in supersonic/hypersonic impactors. The computer simulation results are shown to compare favorably with the experimental data.

scholarly journals A Merged Search‐Coil and Fluxgate Magnetometer Data Product for Parker Solar Probe FIELDS

2020 ◽  
Vol 125 (5) ◽  
Author(s):  
T. A. Bowen ◽  
S. D. Bale ◽  
J. W. Bonnell ◽  
T. Dudok de Wit ◽  
K. Goetz ◽  
...  
Keyword(s):  
Fluxgate Magnetometer ◽  
Search Coil ◽  
Data Product ◽  
Magnetometer Data

Tunneling Effects and Electrical Conductivity of CNT Polymer Composites

2011 ◽  
Vol 1304 ◽  
Author(s):  
S. Xu ◽  
O. Rezvanian ◽  
K. Peters ◽  
M.A. Zikry
Keyword(s):  
Electrical Conductivity ◽  
Polymer Composites ◽  
Current Flow ◽  
Electron Tunneling ◽  
Search Algorithm ◽  
Matrix Material ◽  
Three Dimensional ◽  
Current Transport ◽  
Current Densities ◽  
Tunneling Distance

ABSTRACTA three-dimensional (3D) carbon nanotube (CNT) network computational model was developed to investigate the electrical conductivity and current flow in polymer composites with randomly dispersed CNTs. A search algorithm was developed to determine conductive paths for 3D CNT arrangements and to account for electron tunneling effects. Tunneled currents were obtained as a function of tunneling distance and matrix material. Several possible CNT conductive paths were obtained and finite-element representative volume elements (RVEs) were then used to predict current densities in different CNT arrangements. The predictions indicate that random CNT arrangements can be optimized for current transport.

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