scholarly journals Modulation instability at the upper hybrid layer in high-power radio wave ionospheric heating

Radio Science ◽  
1998 ◽  
Vol 33 (1) ◽  
pp. 143-148 ◽  
Author(s):  
M. J. Keskinen ◽  
P. Rodriguez
Keyword(s):  
Radio Wave ◽  
High Power ◽  
Modulation Instability ◽  
Hybrid Layer ◽  
Ionospheric Heating

Long time scale evolution of high-power radio wave ionospheric heating: 1. Beam propagation

Radio Science ◽  
1993 ◽  
Vol 28 (5) ◽  
pp. 775-784 ◽  
Author(s):  
M. J. Keskinen ◽  
P. K. Chaturvedi ◽  
S. L. Ossakow
Keyword(s):  
Radio Wave ◽  
High Power ◽  
Time Scale ◽  
Beam Propagation ◽  
Ionospheric Heating ◽  
Long Time ◽  
Scale Evolution

SWARM observations of the artificial ionospheric plasma disturbances and field‐aligned currents induced by the SURA power HF heating

2020 ◽  
Author(s):  
Renata Lukianova ◽  
Vladimir Frolov ◽  
Alexander Ryabov
Keyword(s):  
Radio Wave ◽  
High Power ◽  
Current System ◽  
Plasma Heating ◽  
Basic Research ◽  
Magnetic Flux Tube ◽  
Topside Ionosphere ◽  
Electric Currents ◽  
Ionospheric Heating ◽  
Swarm Satellites

<p>It has long been a goal of active experiments to understand the response of the ionosphere to the high-power high-frequency (HF) radio wave pumping. The altitudes of 400-500 km are of particular interest since they correspond to the transition from the region, in which the most intense plasma heating and artificial ionospheric turbulence are observed, to the region where the disturbed plasma escapes to the magnetosphere. No observational data on the properties of plasma turbulence induced by the high-power HF pumping at this altitudinal range existed, until the emergence of a multi-satellite low-orbiting SWARM mission.</p><p>A series of experiments were conducted with a conjunction between the midlatitude SURA ionospheric heating facility and the SWARM satellites. We present the first observations made by SWARM on the plasma perturbations and electric currents induced in the F<sub>2</sub> region ionosphere by the O‐mode radio wave pumping. In the heated region, significant effects include a localized increase of the electron temperature accompanied by stratification of the electron density and the magnetic signatures of field‐aligned currents (FAC) of 0.01-0.02 μA/m<sup>2</sup> densities. The upward FAC is confined within the central part of the artificially perturbed magnetic flux tube, while the return downward current flows through the ambient plasma adjoining to the boundary of the HF-disturbed region. The spatial structure and amplitude of FACs indicate the current system is likely associated with the unipolar diffusion and excitation of eddy electric currents in the topside ionosphere. Similar effects are revealed in the laboratory experiment but not previously observed in space. The spaceborne experimental information is being accumulated and further analysis is underway.</p><p>This study was supported by the Russian Foundation for Basic Research, grant 20-05-00166. </p>

Calculation of the electron density of the F region heated by a high-power radio-wave field

1977 ◽  
Vol 20 (12) ◽  
pp. 1267-1270 ◽  
Author(s):  
Yu. A. Ignat'ev ◽  
Z. N. Krotova ◽  
�. E. Mityakova
Keyword(s):  
Radio Wave ◽  
Wave Field ◽  
Electron Density ◽  
High Power ◽  
F Region

Response of Background Optical Emission to Ionospheric Heating by High-Power Radio Emission

2021 ◽  
Vol 61 (3) ◽  
pp. 389-398
Author(s):  
Yu. K. Legostaeva ◽  
A. V. Shindin ◽  
S. M. Grach
Keyword(s):  
Radio Emission ◽  
High Power ◽  
Optical Emission ◽  
Ionospheric Heating

Novel high-power radio-frequency sources for mobile ionospheric heating

2016 ◽  
Author(s):  
Brian L. Beaudoin ◽  
Jayakrishnan A. Karakkad ◽  
Charles Turner ◽  
Amith H. Narayan ◽  
Connor Thompson ◽  
...  
Keyword(s):  
Radio Frequency ◽  
High Power ◽  
Ionospheric Heating

scholarly journals Perspective Ground-based Method for Diagnostics of the Lower Ionosphere and the Neutral Atmosphere

2013 ◽  
Vol 22 (1) ◽  
Author(s):  
N. V. Bakhmetieva ◽  
G. I. Grigoriev ◽  
A. V. Tolmacheva
Keyword(s):  
Radio Wave ◽  
High Power ◽  
Relative Concentration ◽  
Spectral Characteristics ◽  
Lower Ionosphere ◽  
Internal Gravity Waves ◽  
Spatial Period ◽  
Neutral Atmosphere ◽  
Radio Waves ◽  
D Region

AbstractWe present a new perspective ground-based method for diagnostics of the ionosphere and atmosphere parameters. The method uses one of the numerous physical phenomena observed in the ionosphere illuminated by high-power radio waves. It is a generation of the artificial periodic irregularities (APIs) in the ionospheric plasma. The APIs were found while studying the effects of ionospheric high-power HF modification. It was established that the APIs are formed by a standing wave that occurs due to interference between the upwardly radiated radio wave and its reflection off the ionosphere. The API studies are based upon observation of the Bragg backscatter of the pulsed probe radio wave from the artificial periodic structure. Bragg backscatter occurs if the spatial period of the irregularities is equal to half a wavelength of the probe signal. The API techniques makes it possible to obtain the following information: the profiles of electron density from the lower D-region up to the maximum of the F-layer; the irregular structure of the ionosphere including split of the regular E-layer, the sporadic layers; the vertical velocities in the D- and E-regions of the ionosphere; the turbulent velocities, turbulent diffusion coefficients and the turbopause altitude; the neutral temperatures and densities at the E-region altitudes; the parameters of the internal gravity waves and their spectral characteristics; the relative concentration of negative oxygen ions in the D-region. Some new results obtained by the API technique are discussed.

Thulium fiber lasers – the Modulation Instability and future high power scaling

2018 ◽  
Author(s):  
Martin Richardson ◽  
Alex Sincore ◽  
Don Jin Shin ◽  
Justin Cook ◽  
Joshua Bradford ◽  
...  
Keyword(s):  
High Power ◽  
Fiber Lasers ◽  
Modulation Instability ◽  
Power Scaling

Grating formation by a high power radio wave in near-equator ionosphere

2011 ◽  
Vol 18 (11) ◽  
pp. 112101 ◽  
Author(s):  
Rohtash Singh ◽  
A. K. Sharma ◽  
V. K. Tripathi
Keyword(s):  
Radio Wave ◽  
High Power ◽  
Grating Formation

High Power LiMnPO4Cathode Coated with Hybrid Layer of Li Ion-Conductive Phosphate and Electro-Conductive Carbon

2015 ◽  
Vol 162 (8) ◽  
pp. A1556-A1565 ◽  
Author(s):  
Naoki Hatta ◽  
Yusuke Yoshida ◽  
Hiroki Tomita
Keyword(s):  
High Power ◽  
Hybrid Layer ◽  
Li Ion

scholarly journals Stokes light induced modulation instability in high power continuous wave fiber amplifiers

2021 ◽  
Vol 29 (6) ◽  
pp. 8407
Author(s):  
Mingjian Yan ◽  
Yunhan Zheng ◽  
Huisheng Liang ◽  
Fangxin Li ◽  
Zhigang Han ◽  
...  
Keyword(s):  
High Power ◽  
Modulation Instability ◽  
Continuous Wave ◽  
Fiber Amplifiers
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