Plasma Emission: A Review

Melrose, D. B.

doi:10.1007/978-94-009-3999-8_9

Cited by 8 publications

(6 citation statements)

References 36 publications

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“…In comparison, Type II and III solar radio bursts are thought to be the product of Langmuir wave radiation [ Reid and Ratcliffe , ; Melrose , ]. Electron beams are well known to be efficient drivers of Langmuir waves through the bump‐on‐tail instability, and it is thought that this is the mechanism in which they are produced in Type III bursts.…”

Section: The Nature Of the Emissionmentioning

confidence: 99%

Dynamic radio spectra from two fireballs

et al. 2015

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We present dynamic spectra from the Long Wavelength Array telescope of two large meteors (fireballs) observed to emit between 37 and 54 MHz. These spectra show the first ever recorded broadband measurements of this newly discovered VHF emission. The spectra show that the emission is smooth and steep, getting very bright at lower frequencies. We suggest that this signal is possibly emission of Langmuir waves and that these waves could be excited by a bump‐on‐tail instability within the trail. The spectra of one fireball display broadband temporal frequency sweeps. We suggest that these sweeps are evidence of individual expanding clumps of emitting plasma. While some of these proposed clumps may have formed at the very beginning of the fireball event, others must have formed seconds after the initial event.

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Section: The Nature Of the Emissionmentioning

confidence: 99%

Dynamic radio spectra from two fireballs

et al. 2015

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“…L + L ′ → T ′. These processes have been reviewed by Melrose [1987] and Cairns and Robinson [2000]. More recent theoretical results [ Mitchell et al , 2003] indicate that the electrostatic and electromagnetic decay processes proceed efficiently provided ∣ v b ∣ ≳ (3 − 6) v e .…”

Section: Theoretical Modelmentioning

confidence: 99%

A Quantitative model for terrestrial foreshock radio emissions: 1. Predicted properties

2004

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[1] We present detailed quantitative results from a theoretical model for fundamental ( f p ) and second harmonic (2f p ) radio emission generated in Earth's foreshock by beam-driven Langmuir waves. The model is the first to self-consistently incorporate all key aspects of foreshock physics: reflection and acceleration of incident solar wind electrons at the bow shock, generation of unstable electron beams in the foreshock, stochastic growth of Langmuir waves and their conversion to electromagnetic waves via nonlinear processes. The physical properties of the foreshock electron beams, Langmuir waves and electromagnetic emissivities are calculated as a function of position for nominal solar wind conditions. Variations in the bow shock's location and characteristics with changes in the solar wind parameters are included. The predicted fluxes of f p and 2f p radiation are explored over a wide range of solar wind conditions. We find that the 2f p flux is most sensitive to the electron and ion temperatures and the solar wind speed and that the radio fluxes of both f p and 2f p radiation also vary significantly with the solar wind electron number density, and proportion of nonthermal electrons. Our macroscopic model provides a powerful and unique diagnostic tool with which to interpret observational data from various spacecraft under a range of solar wind conditions.

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“…The generation of whistler waves can be attributed to core‐halo drift or electron heat flux [ Gary et al , ; Wilson et al , ; Kajdič et al , ]. The excitation of Langmuir waves may suggest an electron beam or nonthermal electrons with a loss cone distribution [ Melrose , ; Huang and Huang , ]. The production of ion Alfvén‐cyclotron waves often indicates an ion beam or ion temperature anisotropy [ Gary , ].…”

Section: Introductionmentioning

confidence: 99%

Low‐frequency electromagnetic cyclotron waves in and around magnetic clouds: STEREO observations during 2007–2013

et al. 2017

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Wave activities in the solar wind are an important topic and magnetic clouds (MCs) are a common phenomenon in interplanetary space, though waves activities associated with MCs have not been well documented. Based on a survey of 120 MCs observed by STEREO spacecraft during the years 2007–2013, this work studies electromagnetic cyclotron waves (ECWs) near the proton cyclotron frequency in and around MCs. For total 7807 ECW events, 24% of them occurred in the regions within MCs while 76% occurred in the regions around MCs. Statistics indicate that ECWs around MCs have higher frequencies, wider bandwidths, and stronger powers relative to the waves in MCs. More ECWs, on the other hand, tend to be related to a plasma with higher temperature, lower density, and larger velocity. In particular, it is found that there exist positive power law correlations between plasma betas and the wave frequencies, bandwidths, and powers. The results imply that the plasma beta should play an important role in determining the properties of ECWs, which is consistent with previous theory studies and the recent simulation results.

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Plasma Emission: A Review

Cited by 8 publications

References 36 publications

Dynamic radio spectra from two fireballs

Dynamic radio spectra from two fireballs

A Quantitative model for terrestrial foreshock radio emissions: 1. Predicted properties

Low‐frequency electromagnetic cyclotron waves in and around magnetic clouds: STEREO observations during 2007–2013

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