scholarly journals A simulation study of 630 nm and 557.7 nm airglow variations due to dissociative recombination and thermal electrons by high-power HF heating

2017 ◽  
Vol 1 (1) ◽  
pp. 44-52
Author(s):  
Tong Dang ◽  
◽  
JiuHou Lei ◽  
XianKang Dou ◽  
WeiXing Wan ◽  
...  
Keyword(s):  
Simulation Study ◽  
High Power ◽  
Dissociative Recombination ◽  
Hf Heating

scholarly journals Simulation study of the large-scale modification of the mid-latitude F-layer by HF radio waves with different powers

2012 ◽  
Vol 30 (8) ◽  
pp. 1213-1222 ◽  
Author(s):  
G. I. Mingaleva ◽  
V. S. Mingalev ◽  
O. V. Mingalev
Keyword(s):  
Mathematical Model ◽  
Simulation Study ◽  
High Power ◽  
Large Scale ◽  
Radio Waves ◽  
Effective Frequency ◽  
Heating Facility ◽  
Absorbed Power

Abstract. A mathematical model of the ionosphere, developed earlier, is applied to investigate the large-scale mid-latitude F-layer modification by HF radio waves with different powers. Simulations are performed for the point with geographic coordinates of the "Sura" heating facility (Nizhny Novgorod, Russia) for autumn conditions. The calculations are made for distinct cases, in which the effective absorbed power has different values belonging to the 5–100 MW range, both for nocturnal and daytime conditions. The frequency of powerful HF waves is chosen to be close to the most effective frequency for the large-scale F2-layer modification. The results of modeling indicate that the effective absorbed power can influence considerably the F-layer response to high-power radio waves in the mid-latitude ionosphere.

scholarly journals A coupled ionosphere-raytrace model for high-power HF heating

2015 ◽  
Vol 42 (22) ◽  
pp. 9650-9656 ◽  
Author(s):  
K. A. Zawdie ◽  
J. D. Huba ◽  
D. P. Drob ◽  
P. A. Bernhardt
Keyword(s):  
High Power ◽  
Hf Heating

Simulation study on high frequency characteristics of X-band high power relative klystron amplifier

2014 ◽  
Vol 26 (2) ◽  
pp. 23006 ◽  
Author(s):  
朱丹妮 Zhu Danni ◽  
张军 Zhang Jun ◽  
李伟 Li Wei ◽  
戚祖敏 Qi Zumin
Keyword(s):  
Simulation Study ◽  
High Power ◽  
High Frequency ◽  
Frequency Characteristics ◽  
X Band

Simulation Study of on-state Losses as Function of Carrier Life-time for a GaN/SiC High Power HBT Design

1999 ◽  
Vol T79 (1) ◽  
pp. 290 ◽  
Author(s):  
E. Danielsson ◽  
B. Breitholtz ◽  
C.-M. Zetterling ◽  
and M. ?stling
Keyword(s):  
Simulation Study ◽  
High Power ◽  
Life Time ◽  
Carrier Life Time

Numerical modeling of artificial ionospheric layers driven by high-power HF heating

2012 ◽  
Vol 117 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
B. Eliasson ◽  
X. Shao ◽  
G. Milikh ◽  
E. V. Mishin ◽  
K. Papadopoulos
Keyword(s):  
Numerical Modeling ◽  
High Power ◽  
Hf Heating

A simulation study on residual thermal stresses in high power GaN LEDs

2017 ◽  
Author(s):  
Bindhya Raj Ankit ◽  
Bhupendra Singh Dhakad ◽  
Amitabh Chatterjee ◽  
Uday Shanker Dixit
Keyword(s):  
Simulation Study ◽  
High Power ◽  
Thermal Stresses

scholarly journals Incidence angle dependence of Langmuir turbulence and artificial ionospheric layers driven by high-power HF-heating

2014 ◽  
Vol 81 (2) ◽  
Author(s):  
B. Eliasson ◽  
G. Milikh ◽  
X. Shao ◽  
E. V. Mishin ◽  
K. Papadopoulos
Keyword(s):  
High Power ◽  
Incidence Angle ◽  
Beam Width ◽  
Electron Acceleration ◽  
Langmuir Turbulence ◽  
Ionospheric Heating ◽  
Turbulent Layer ◽  
Neutral Gas ◽  
Radio Transmitters ◽  
Hf Heating

We have numerically investigated the development of strong Langmuir turbulence (SLT) and associated electron acceleration at different angles of incidence of ordinary (O) mode pump waves. For angles of incidence within the Spitze cone, the turbulence initially develops within the first maximum of the Airy pattern near the plasma resonance altitude. After a few milliseconds, the turbulent layer shifts downwards by about 1 km. For injections outside the Spitze region, the turning point of the pump wave is at lower altitudes. Yet, an Airy-like pattern forms here, and the turbulence development is quite similar to that for injections within the Spitze. SLT leads to the acceleration of 10–20 eV electrons that ionize the neutral gas thereby creating artificial ionospheric layers. Our numerical modeling shows that most efficient electron acceleration and ionization occur at angles between the magnetic and geographic zenith, where SLT dominates over weak turbulence. Possible effects of the focusing of the electromagnetic beam on magnetic field-aligned density irregularities and the finite heating beam width at the magnetic zenith are also discussed. The results have relevance to ionospheric heating experiments using ground-based, high-power radio transmitters to heat the overhead plasma, where recent observations of artificial ionization layers have been made.

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