Changes of the electron concentration profile during local heating of the ionospheric plasma

Blaunstein, Nathan

doi:10.1016/0021-9169(95)00160-3

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…Numerical modelling of plasma and electron temperature distribution in the ionosphere heated by powerful radio waves has been undertaken many times, e.g. Hansen et al (1990), Blaunstein (1996Blaunstein ( , 1997, Guzdar et al (1998), Gondarenko et al (1999). These papers either considered large-scale modification in which transverse transport can be neglected or only included it approximately.…”

Section: Numerical Analysis Of the Distribution Of Plasma And Electromentioning

confidence: 99%

Stationary state and relaxation of artificial irregularities excited in ionospheric heating experiments

Borisov

Senior²,

Honary³

2005

J. Plasma Phys.

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We analytically and numerically discuss the plasma distribution and electron temperature enhancement in striations for a given heating source. It is shown that, in stationary conditions, the reduced plasma concentration and the temperature enhancement should be of the same order of magnitude. We deduce that the electron temperature inside striations cannot greatly exceed that in the heated volume. The elongation of striations is calculated for different transverse scales and heating powers. We show that medium sized irregularities are associated with striations and develop after the formation of striations. The peculiarities of the relaxation process for small-scale and medium sized artificial irregularities are investigated and it is found that the relaxation of small-scale irregularities exhibits two time scales, in qualitative agreement with experimental observations.

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Section: Numerical Analysis Of the Distribution Of Plasma And Electromentioning

confidence: 99%

Stationary state and relaxation of artificial irregularities excited in ionospheric heating experiments

Borisov

Senior²,

Honary³

2005

J. Plasma Phys.

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“…Consequently, as the electron temperature increases, the dissociative recombination coefficient decreases and results in the increase of the electron density. However, when electron temperature and density start to change, many kinds of ionospheric heating phenomena will probably appear, including large-scale ionospheric electron density/temperature modulation, stimulated electromagnetic emissions, Langmuir turbulence, and artificial field-aligned irregularities [Allen et al, 1974;Utlaut and Violette, 1974;Graham and Fejer, 1976;Frey et al, 1984;Bernhardt et al, 1988Bernhardt et al, , 1989Stocker et al, 1992;DuBois et al, 1993;Kelley et al, 1995;Blaunstein, 1996]. Therefore, a number of review papers with details of theoretical studies have been published.…”

Section: Introductionmentioning

confidence: 99%

Saturation effects of the lower ionosphere based on two‐dimensional HF heating model

Cheng

Guo

2017

JGR Space Physics

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This paper presents a two‐dimensional (2‐D) theoretical model of the lower ionospheric heating by high‐frequency (HF) electromagnetic waves. Compared with the traditional one‐dimensional model, we develop the half‐power width of the heating beam into the theoretical formulations, which dictates the 2‐D distribution characteristics of electron temperature and density perturbations; we also introduce the Sodankylä Ion Chemistry (SIC) model. Based on this numerical model, the saturation effect of ionospheric electron temperature and density is investigated, and simulation is performed by heating at a wave frequency of 6 MHz. Results show that because of energy absorption, the electron temperature peaks at 74 km, and the relative increment of electron density peaks at 94 km in the height direction. Conversely, both the maximum perturbations of electron temperature and density appear on the beam center in the horizontal direction. Second, the saturation time of electron temperature initially increases slowly and then rapidly with increased height. Meanwhile, the saturation time of electron density decreases with increased height. In the horizontal aspect, both the saturation time of electron temperature and density are symmetrical at approximately the position of the beam center owing to the initial Gaussian distribution. Electron temperature far from the beam center results in a long saturation time. Conversely, with increased distance from the beam center, the saturation time of electron density decreases.

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“…Wave‐particle and wave‐wave interaction processes have been observed, and new understandings have been acquired in the fields of plasma physics. These ionospheric heating phenomena primarily include large‐scale ionospheric electron density/temperature modulation, anomalous absorption, enhanced plasma line, stimulated electromagnetic emissions (SEEs), enhanced airglow, Langmuir turbulence, and artificial field‐aligned irregularities (FAIs) [ Allen et al ., ; Utlaut and Violette , ; Graham and Fejer , ; Frey et al ., ; Bernhardt et al ., , ; Stocker et al ., ; DuBois et al ., ; Kelley et al ., ; Blaunstein , ]. The temporal scale of these phenomena excited by ionospheric heating ranges from microseconds to minutes and the spatial scale ranges from a few decimeters to tens of kilometers.…”

Section: Introductionmentioning

confidence: 99%

“…However, at high altitude at the F region, the transportation process and anomalous absorption dominates. Pressure gradient causes a depletion of the electron density in the center of theheating region along the field line [Hansen et al, 1989[Hansen et al, , 1992bBlaunstein, 1996;Mingaleva et al, 2003Mingaleva et al, , 2009]. Ohmic heating is not expected to produce huge changes of ionospheric electron density and temperature.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of large‐scale ionospheric modulation due to the thermal process by powerful wave heating

Zhou

Wang

et al. 2016

JGR Space Physics

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We present a three‐dimensional numerical model of large‐scale ionospheric electron density and temperature modulation by powerful electromagnetic waves by incorporating the transport equations and the three‐dimensional ray‐tracing algorithm. Based on this numerical model, the changes of ionospheric electron density and temperature at nighttime are investigated. The simulation results present (1) the ionospheric electron temperature enhancement due to the energy absorption; (2) the ionospheric electron density depletion at the reflection region and enhancement at the upper/lower region along the field line due to the thermal pressure; and (3) large‐scale field‐aligned irregularities (FAIs) due to the thermal self‐focusing instability with transverse scale of ~10 km. The results are quantitatively consistent with the previous theoretical predictions and experimental observations, which indicate that the thermal processes play an important role in the ionospheric electron density/temperature modulation and large‐scale FAI generation.

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Changes of the electron concentration profile during local heating of the ionospheric plasma

Cited by 13 publications

References 9 publications

Stationary state and relaxation of artificial irregularities excited in ionospheric heating experiments

Stationary state and relaxation of artificial irregularities excited in ionospheric heating experiments

Saturation effects of the lower ionosphere based on two‐dimensional HF heating model

A numerical study of large‐scale ionospheric modulation due to the thermal process by powerful wave heating

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