scholarly journals Impact of Switchbacks on Turbulent Cascade and Energy Transfer Rate in the Inner Heliosphere

2021 ◽  
Vol 922 (1) ◽  
pp. L11
Author(s):  
Carlos S. Hernández ◽  
Luca Sorriso-Valvo ◽  
Riddhi Bandyopadhyay ◽  
Alexandros Chasapis ◽  
Christian L. Vásconez ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Rate ◽  
Positive Energy ◽  
Magnetic Fluctuations ◽  
Energy Transfer Rate ◽  
Third Order ◽  
Additional Energy ◽  
The Magnetic Field ◽  
Turbulent Cascade ◽  
Inner Heliosphere

Abstract Recent Parker Solar Probe (PSP) observations of inner heliospheric plasma have shown an abundant presence of Alfvénic polarity reversal of the magnetic field, known as “switchbacks.” While their origin is still debated, their role in driving the solar wind turbulence has been suggested through analysis of the spectral properties of magnetic fluctuations. Here, we provide a complementary assessment of their role in the turbulent cascade. The validation of the third-order linear scaling of velocity and magnetic fluctuations in intervals characterized by a high occurrence of switchbacks suggests that, irrespective of their local or remote origin, these structures are actively embedded in the turbulent cascade, at least at the radial distances sampled by PSP during its first perihelion. The stronger positive energy transfer rate observed in periods with a predominance of switchbacks indicates that they act as a mechanism injecting additional energy in the turbulence cascade.

scholarly journals Local energy transfer rate and kinetic processes: the fate of turbulent energy in two-dimensional hybrid Vlasov–Maxwell numerical simulations

2018 ◽  
Vol 84 (2) ◽  
Author(s):  
Luca Sorriso-Valvo ◽  
Denise Perrone ◽  
Oreste Pezzi ◽  
Francesco Valentini ◽  
Sergio Servidio ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Rate ◽  
Scaling Laws ◽  
Turbulent Energy ◽  
Positive Energy ◽  
Small Scale ◽  
Local Energy ◽  
Two Dimensional ◽  
Energy Transfer Rate ◽  
Kinetic Processes

The nature of the cross-scale connections between the inertial-range turbulent energy cascade and the small-scale kinetic processes in collisionless plasmas is explored through the analysis of two-dimensional hybrid Vlasov–Maxwell numerical simulation (HVM), with $\unicode[STIX]{x1D6FC}$ particles, and through a proxy of the turbulent energy transfer rate, namely the local energy transfer (LET) rate. Correlations between pairs of variables, including those related to kinetic processes and to deviation from Maxwellian distributions, are first evidenced. Then, the general properties and the statistical scaling laws of the LET are described, confirming its reliability for the description of the turbulent cascade and revealing its textured topology. Finally, the connection between such proxy and the diagnostic variables is explored using conditional averaging, showing that several quantities are enhanced in the presence of large positive energy flux, and reduced near sites of negative flux. These observations can help in determining which processes are involved in the dissipation of energy at small scales, as for example the ion-cyclotron or mirror instabilities typically associated with perpendicular anisotropy of temperature.

scholarly journals On the Statistical Properties of Turbulent Energy Transfer Rate in the Inner Heliosphere

Solar Physics ◽  
2018 ◽  
Vol 293 (1) ◽  
Author(s):  
Luca Sorriso-Valvo ◽  
Francesco Carbone ◽  
Silvia Perri ◽  
Antonella Greco ◽  
Raffaele Marino ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Rate ◽  
Turbulent Energy ◽  
Statistical Properties ◽  
Energy Transfer Rate ◽  
Inner Heliosphere

scholarly journals Electromagnetic Proton Beam Instabilities in the Inner Heliosphere: Energy Transfer Rate, Radial Distribution and Effective Excitation

2021 ◽  
Author(s):  
Wen Liu ◽  
Jinsong Zhao ◽  
Huasheng Xie ◽  
Dejin Wu
Keyword(s):  
Solar Wind ◽  
Energy Transfer ◽  
Proton Beam ◽  
Transfer Rate ◽  
Ion Beam ◽  
Beam Instability ◽  
Energy Transfer Rate ◽  
Differential Flow ◽  
Effective Growth ◽  
Inner Heliosphere

<p>Differential flow among different ion species are always observed in the solar wind, and such ion differential flow can provide a free energy to drive the Alfven/ion-cyclotron and fast-magnetosonic/whistler instabilities. Previous works on the ion beam instability are mainly focused on the solar wind parameters at 1 au. We extend this study using the radial model of the magnetic field and plasma parameters in the inner heliosphere. We present the distributions of the energy transfer rate among the unstable waves and the particles, which would be useful to predict the change of parallel and perpendicular temperatures during the instability evolution. Moreover, we propose an effective growth length to estimate the effective growth in each instability, and we explore that the oblique Alfven/ion-cyclotron instability, the oblique fast-magnetosonic/whistler instability and the oblique Alfven/ion-beam instability can be effectively driven by proton beams having speed of 500-2000 km/s in the solar atmosphere. We also show that the unstable waves driven by the proton beam instability would be responsible for the solar corona heating. These predictions can be checked by in situ satellite measurements in the inner heliosphere.</p>

scholarly journals Turbulent Cascade and Energy Transfer Rate in a Solar Coronal Mass Ejection

2021 ◽  
Vol 919 (2) ◽  
pp. L30
Author(s):  
Luca Sorriso-Valvo ◽  
Emiliya Yordanova ◽  
Andrew P. Dimmock ◽  
Daniele Telloni
Keyword(s):  
Energy Transfer ◽  
Coronal Mass Ejection ◽  
Transfer Rate ◽  
Energy Transfer Rate ◽  
Mass Ejection ◽  
Turbulent Cascade ◽  
Solar Coronal

Extraction of energy transfer rate constants from the pulsed laser generated thermal lens spectrometer signal

1982 ◽  
Vol 80 ◽  
pp. 433-436 ◽  
Author(s):  
R.T. Bailey ◽  
F.R. Cruickshank ◽  
R. Guthrie ◽  
D. Pugh ◽  
I.J.M. Weir
Keyword(s):  
Energy Transfer ◽  
Thermal Lens ◽  
Rate Constants ◽  
Transfer Rate ◽  
Pulsed Laser ◽  
Energy Transfer Rate

scholarly journals Research on the design and application of capillary heat exchangers for heat pumps in coastal areas

2021 ◽  
Vol 42 (3) ◽  
pp. 333-348
Author(s):  
Zhenpeng Bai ◽  
Yanfeng Li ◽  
Jin Zhang ◽  
Alan Fewkes ◽  
Hua Zhong
Keyword(s):  
Renewable Energy ◽  
Energy Transfer ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Transfer Rate ◽  
Coastal Areas ◽  
Heat Energy ◽  
Low Carbon ◽  
Energy Transfer Rate ◽  
Pump System

This study investigated the optimal design of a capillary heat exchanger device for the heat pump system and its innovative engineering application in a building. The overall aim was to use a capillary heat exchanger to obtain energy in coastal areas for promoting renewable energy in low-carbon building design. Initially, the main factors affecting the efficiency of the capillary heat exchanger were identified, a mathematical model was then established to analyse the heat transfer process. The analysis showed the flow rate and the capillary length are the key factors affecting the efficiency of the capillary heat exchanger. Secondly, to optimize the structural design of the capillary heat exchanger, the heat energy transfer is calculated with different lengths of the capillary under various flow rates in summer and winter conditions, respectively. Thirdly, a typical building is selected to analyse the application of the capillary heat exchanger for extracting energy in the coastal area. The results show the performance of the selected capillary heat exchanger heat pump system, in winter, the heat energy transfer rate is 60 W/m2 when the seawater temperature is 3.7 °C; in summer, the heat energy transfer rate is 150 W/m2 when the seawater temperature is 24.6 °C. Finally, the above field test results were examined using a numerical simulation model, the test and simulation results agree with each other quite well. This paper is conducive in promoting the development of the capillary heat exchanger heat pump as an innovative sustainable technology for net-zero energy and low carbon buildings using renewable energy in coastal areas. Practical application: A recently proposed capillary heat exchanger is used as an energy extraction and utilisation device to obtain energy in coastal areas for promoting renewable energy in low-carbon building design. This paper explores the application of a capillary heat exchanger as both cold and heat sources for application in typical low-rise buildings. The analysis of the heat energy transfer rate of a typical low-rise building located in a coastal area in summer and winter provides guidance for the application of capillary heat exchangers.

Improvement of Er3+:4I11/2→Ce3+:2F5/2 energy transfer rate in Er3+/Ce3+ co-doped TeO2–ZnO–Na2O–Nb2O5 glasses

2009 ◽  
Vol 129 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Yaxun Zhou ◽  
Jun Wang ◽  
Shixun Dai ◽  
Tiefeng Xu ◽  
Qiuhua Nie ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Transfer Rate ◽  
Energy Transfer Rate ◽  
Co Doped
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