scholarly journals Mode Conversion and Reflection of Langmuir Waves in an Inhomogeneous Solar Wind

2001 ◽  
Vol 18 (4) ◽  
pp. 355-360 ◽  
Author(s):  
A. J. Willes ◽  
Iver H. Cairns
Keyword(s):  
Solar Wind ◽  
Electromagnetic Waves ◽  
Plasma Frequency ◽  
Mode Conversion ◽  
Langmuir Wave ◽  
Solar Wind Plasma ◽  
Langmuir Waves ◽  
Transverse Electromagnetic ◽  
Solar Wind Parameters ◽  
Conversion Efficiencies

AbstractBeam-driven Langmuir waves in the solar wind are generated just above the electron plasma frequency, which fluctuates in the inhomogeneous solar wind plasma. Consequently, propagating Langmuir waves encounter regions in which the wave frequency is less than the local plasma frequency, where they can be reflected, mode converted to transverse electromagnetic waves, and trapped in density wells. The aim here is to investigate Langmuir wave reflection and mode conversion at a linear density gradient for typical solar wind parameters. It is shown that higher mode conversion efficiencies are possible than previously calculated, but that mode conversion occurs in a smaller region of parameter space. In addition, the possibility of detecting mode conversion with in situ spacecraft Langmuir wave observations is discussed.

scholarly journals On the influence of Langmuir wave spectra on the spectra of electromagnetic waves generated in solar plasma with double plasma frequency

2021 ◽  
Vol 503 (4) ◽  
pp. 5740-5745
Author(s):  
Igor V Kudryavtsev ◽  
T I Kaltman
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Plasma Frequency ◽  
Langmuir Wave ◽  
Wave Spectra ◽  
Langmuir Waves ◽  
Solar Plasma ◽  
Transverse Electromagnetic

ABSTRACT In this paper, we consider the spectral dependences of transverse electromagnetic waves generated in solar plasma at the coalescence of Langmuir waves. It is shown that different spectra of Langmuir waves lead to characteristic types of transversal electromagnetic wave spectra, what makes it possible to diagnose the features of the spectra of Langmuir waves generated in solar plasma.

scholarly journals Large-Scale Structure and Termination of the Heliosphere

1998 ◽  
Vol 11 (2) ◽  
pp. 851-856 ◽  
Author(s):  
W. M. Macek
Keyword(s):  
Solar Wind ◽  
Large Scale ◽  
Second Harmonic ◽  
Source Region ◽  
Langmuir Wave ◽  
Solar Wind Plasma ◽  
Langmuir Waves ◽  
Post Shock ◽  
Wind Intensity

AbstractThe question of the boundaries of the heliosphere is considered. The termination heliospheric shock should exist because the solar wind plasma flowing supersonically away from the Sun must make a transition to a subsonic flow. The heliopause is at the outermost extend of the solar wind. Beyond the heliopause lies the (very local) interstellar wind. Intensity of radio emissions at 2 to 3 kHz detected by the Voyager plasma wave instrument in the outer heliosphere can be explained provided that the electron beams generating Langmuir waves exist in the post-shock plasma due to secondary shocks in the compressed solar wind beyond the termination shock. The field strengths of Langmuir waves required to generate the second harmonic emissions are 50 – 100 μ V m-1. Alternatively, the emissions are generated in the vicinity of the heliopause. The Voyager 1 and 2 are proceeding toward a likely source region for Langmuir wave and these waves may be observed in situ in the near future.

Multiple-Frequency Measurements of a Flare Continuum Event

1982 ◽  
Vol 4 (4) ◽  
pp. 389-392 ◽  
Author(s):  
R.D. Robinson
Keyword(s):  
Solar Flares ◽  
Electromagnetic Waves ◽  
Plasma Frequency ◽  
Close Association ◽  
Type Ii ◽  
Multiple Frequency ◽  
Langmuir Waves ◽  
Long Duration ◽  
Type Ii Radio Bursts ◽  
The Continuum

A type of metre-wavelength continuum is observed in close association with solar flares and Type II radio bursts. This continuum is stationary in position, often intense, of a long duration (occasionally lasting well over an hour) and highly polarized (Robinson and Smerd 1975; Robinson 1978). It is thought to be produced by the conversion of Langmuir waves to electromagnetic waves near the local plasma frequency. Because of its close association with Type II bursts, the class has been designated as Type II related flare continuum, or FCII. In this paper I examine a particularly clear example of such an event, with emphasis on the relation between the Type II and the start of the continuum.

Excitation of Electrostatic Fields in a Plasma by Transverse Electromagnetic Waves

1971 ◽  
Vol 49 (24) ◽  
pp. 3221-3226 ◽  
Author(s):  
M. P. Bachynski ◽  
B. W. Gibbs
Keyword(s):  
Electromagnetic Wave ◽  
Incident Wave ◽  
Electromagnetic Waves ◽  
Plasma Frequency ◽  
Incident Field ◽  
Isotropic Plasma ◽  
Electrostatic Fields ◽  
Plane Transverse ◽  
Dielectric Coefficient ◽  
Transverse Electromagnetic

An experiment has been conducted in which a plane transverse electromagnetic wave is incident from free space on a layer of isotropic plasma at small angles (0–12°) of incidence. Strong longitudinal electrostatic fields are observed within the plasma in the regions where the radian frequency of the incident wave equals the plasma frequency when the electric vector of the incident field is in the plane of incidence. Only weak longitudinal electrostatic fields are observed if the incident electric field is perpendicular to the plane of incidence. The observed phenomenon appears consistent with the field growth in a region where the dielectric coefficient of a plasma becomes zero.

scholarly journals Nonlinear generation of the fundamental radiation in plasmas: the influence of induced ion-acoustic and Langmuir waves

1992 ◽  
Vol 48 (1) ◽  
pp. 71-84 ◽  
Author(s):  
F. B. Rizzato ◽  
A. C.-L. Chian
Keyword(s):  
Electromagnetic Waves ◽  
Plasma Frequency ◽  
Low Frequency ◽  
Emission Mechanism ◽  
Langmuir Waves ◽  
Laboratory Plasmas ◽  
Ion Acoustic ◽  
Present Context ◽  
Fundamental Radiation ◽  
Stream Instability

A nonlinear emission mechanism of electromagnetic waves at the fundamental plasma frequency has been examined by Chian & Alves. This mechanism is based on the electromagnetic oscillating two-stream instability driven by two oppositely propagating Langmuir waves. The excitation of the electromagnetic oscillating two-stream instability is due to nonlinear wave–wave coupling involving Langmuir waves, low-frequency density waves and electromagnetic waves. In this paper the Chian & Alves model is improved using the generalized Zakharov equations. Attention is directed toward the influence of induced low-frequency and Langmuir waves on the properties of the electromagnetic oscillating two-stream instability. Presumably, the properties derived in the present context may be relevant to both space and laboratory plasmas.

POSSIBLE CONNECTION BETWEEN THE EARTHQUAKES TREMORS ONSET IN THE YELLOWSTONE SUPERVOLCANO’S SEISMIC ZONE AND INFLUENCE OF SOLAR FLARE PLASMA

2020 ◽  
Vol 42 (3) ◽  
pp. 283-292
Author(s):  
DMITRIY GONSIROVSKYI
Keyword(s):  
Solar Wind ◽  
Solar Flares ◽  
Solar Wind Plasma ◽  
Seismic Zone ◽  
Additional Energy ◽  
Near Surface ◽  
The Earth ◽  
General Scientific ◽  
Solar Wind Origin ◽  
Solar Wind Parameters

The correlation between solar flares and coronal mass ejections generating solar wind plasma flows towards the Earth and the dynamics in time and power of earthquakes in the area of the Yellowstone supervolcano, that was not previously studied, is considered in four examples. The method of graphical correlation between the values of solar wind parameters, which bursts are directly related to the activation of solar processes, and subsequent increases in the values of earthquake magnitudes and their repeatability was used as a research tool. The author assumes that an additional energy input occurs to shallow earthquake foci and increases their power due to the action of breakthrough injections of plasma clumps into the Earth’s near-surface area detached into the magnetosphere geo-effective solar wind components. The problem under discussion is considered to be acute in connection with the work carried out here to predict a volcanic eruption. In the general scientific plan, it is proposed to include earthquakes study in programs of education as one of points for registration the influence of factors of solar-wind origin.

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