scholarly journals Convection Electric Field and Plasma Convection in a Twisted Magnetotail: A THEMIS Case Study 1-2 January 2009

2018 ◽  
Vol 123 (9) ◽  
pp. 7486-7497 ◽  
Author(s):  
T. Pitkänen ◽  
A. Kullen ◽  
Q. Q. Shi ◽  
M. Hamrin ◽  
A. De Spiegeleer ◽  
...  
Keyword(s):  
Electric Field ◽  
Plasma Convection ◽  
Convection Electric Field

scholarly journals Magnetospheric convection electric field dynamics andstormtime particle energization: case study of the magneticstorm of 4 May 1998

2004 ◽  
Vol 22 (2) ◽  
pp. 497-510 ◽  
Author(s):  
G. V. Khazanov ◽  
M. W. Liemohn ◽  
T. S. Newman ◽  
M.-C. Fok ◽  
A. J. Ridley
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Transport Model ◽  
Storm Event ◽  
Inner Magnetosphere ◽  
Narrow Channels ◽  
Near Earth Space ◽  
Magnetospheric Convection ◽  
Convection Electric Field ◽  
Seed Population

Abstract. It is shown that narrow channels of high electric field are an effective mechanism for injecting plasma into the inner magnetosphere. Analytical expressions for the electric field cannot produce these channels of intense plasma flow, and thus, result in less entry and adiabatic energization of the plasma sheet into near-Earth space. For the ions, omission of these channels leads to an underprediction of the strength of the stormtime ring current and therefore, an underestimation of the geoeffectiveness of the storm event. For the electrons, omission of these channels leads to the inability to create a seed population of 10-100 keV electrons deep in the inner magnetosphere. These electrons can eventually be accelerated into MeV radiation belt particles. To examine this, the 1-7 May 1998 magnetic storm is studied with a plasma transport model by using three different convection electric field models: Volland-Stern, Weimer, and AMIE. It is found that the AMIE model can produce particle fluxes that are several orders of magnitude higher in the L = 2 – 4 range of the inner magnetosphere, even for a similar total cross-tail potential difference. Key words. Space plasma physics (charged particle motion and acceleration) – Magnetospheric physics (electric fields, storms and substorms)

The local electric field favours more than exposed nitrogen atoms on CO2 capture: a case study on the rht-type MOF platform

2015 ◽  
Vol 51 (47) ◽  
pp. 9636-9639 ◽  
Author(s):  
Wen-Yang Gao ◽  
Tony Pham ◽  
Katherine A. Forrest ◽  
Brian Space ◽  
Lukasz Wojtas ◽  
...  
Keyword(s):  
Electric Field ◽  
Co2 Capture ◽  
Local Electric Field

Investigations of CO2 adsorption in two rht-MOFs indicated that the local electric field favours more than the exposed nitrogen atoms for the interactions with CO2 molecules.

Dynamic Response of an Electrospun PVDF-Fe3O4 Piezoelectric Composite Microfiber

2019 ◽  
Author(s):  
Krishna Chytanya Chinnam ◽  
Arnaldo Casalotti ◽  
Giulia Lanzara
Keyword(s):  
Electric Field ◽  
Dynamic Response ◽  
Resonance Frequency ◽  
Piezoelectric Composite ◽  
Test Results ◽  
Ac Electric Field ◽  
Wide Range ◽  
Pvdf Matrix ◽  
Fine Tune

Abstract In this paper the dynamic response of an electrospun nanocomposite piezoelectric microfiber is investigated. The microfiber is formed by magnetic nanoparticles dispersed in Polyvinylidene (PVDF) matrix. Focus is given on the influence of an AC electric field on the dynamic response of the microfiber. In particular, the resonance frequency of the fiber was assessed under an increasing AC electric field at a wide range of frequencies. The electromechanical test results show that the resonance frequency of the fiber is influenced by the applied voltage and, for this case study, it decreases with increasing voltage. The results reported in this paper suggest that, once the mechanism behind such response is fully understood, composite piezoelectric microfibers can be used to fine-tune the resonance frequency of hosting devices.

scholarly journals Energetic ion injection and formation of the storm-time symmetric ring current

2006 ◽  
Vol 24 (12) ◽  
pp. 3547-3556 ◽  
Author(s):  
L. Xie ◽  
Z. Y. Pu ◽  
X. Z. Zhou ◽  
S. Y. Fu ◽  
Q.-G. Zong ◽  
...  
Keyword(s):  
Electric Field ◽  
Ring Current ◽  
Particle Trajectory ◽  
Three Dimensional ◽  
Extensive Study ◽  
Current Injection ◽  
Ion Injection ◽  
Convection Electric Field ◽  
Trajectory Calculations ◽  
Current Region

Abstract. An extensive study of ring current injection and intensification of the storm-time ring current is conducted with three-dimensional (3-D) test particle trajectory calculations (TPTCs). The TPTCs reveal more accurately the process of ring current injection, with the main results being the following: (1) an intense convection electric field can effectively energize and inject plasma sheet particles into the ring current region within 1–3 h. (2) Injected ions often follow chaotic trajectories in non-adiabatic regions, which may have implications in storm and ring current physics. (3) The shielding electric field, which arises as a consequence of enhanced convection and co-exists with the injection and convection electric field, may cause the original open trajectories of injected ions with higher energy to change into closed ones, thus playing a role in the formation of the symmetric ring current.

scholarly journals Scenarios Approach to the Electromagnetic Exposure: The Case Study of a Train Compartment

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
A. Paffi ◽  
F. Apollonio ◽  
R. Pinto ◽  
M. Liberti
Keyword(s):  
Electric Field ◽  
Electromagnetic Fields ◽  
Cell Phones ◽  
International Guideline ◽  
Cell Orientation ◽  
Field Distributions ◽  
Exposure Levels ◽  
The Individual ◽  
Good Agreement

Previous studies identified the train compartment as the place where people can experience the highest exposure levels (still below the international guideline limits) to electromagnetic fields in the radiofrequency range. Here a possible scenario of a train compartment has been reproduced and characterized, both numerically and experimentally. A good agreement between the simulated electric field distributions and measurements has been found. Results indicate that the higher values of exposure in specific positions inside the train compartment depend on the number of active cell phones, the bad coverage condition, the cell orientation, and the presence of metallic walls. This study shows that the proposed approach, based on the scenarios characterization, may efficiently support the assessment of the individual electromagnetic exposure.

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