Solar wind density model from km-wave type III bursts

Álvarez, H.; Haddock, F. T.

doi:10.1007/bf00153449

Cited by 108 publications

(113 citation statements)

References 15 publications

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“…The burst drifts down in frequency due to the beam propagation into low-density regions. Using the approach by Alvarez & Haddock (1973) 2. The radio flux and its variation with frequency are consistent with observations (e.g., Wild et al 1954;Suzuki & Dulk 1985).…”

Section: Simulation Resultsmentioning

confidence: 99%

Simulated Dynamic Spectra: A Group of Coronal Type III Bursts

2007

ApJ

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First simulations are presented for the dynamic spectra of a group of coronal type III bursts that are observed remotely at Earth. A three-dimensional model is developed, including the structure of the source region, dynamics of electron beams, Langmuir, ion-sound, and electromagnetic waves within the source, and propagation of radiation to Earth. For realistic coronal and beam acceleration parameters, the simulation results are consistent with the general characteristics of type III bursts. We demonstrate that multiple radio bursts at high frequencies in the group merge at low frequencies, due mainly to a previously proposed mechanism which leads to merging of beams in the presence of beams and Langmuir waves only. The radio flux after the merging, however, depends jointly on beam-wave and wave-wave interactions and propagation effects.

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Section: Simulation Resultsmentioning

confidence: 99%

Simulated Dynamic Spectra: A Group of Coronal Type III Bursts

2007

ApJ

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“…Direct analyses of in situ D ensity measurements within the radio burst source location and a thorough understanding of the influence of scattering in the interplanetary medium art certainly needed before the interplanetary radio burst methods can be very accurately used as a common tool to remotely determine the solar wind density. For instance density models 7: Fainberg and Stone (1971) 8: Alvarez and Haddock (1973): the model shown on this Figure is normalized to the 1 AU Helios density found in this paper (6.14 cm -3 .) 9: Bougeret et al (1982) 10: The Helios density model found in this paper.…”

Section: The Density Falloffmentioning

confidence: 97%

“…Following Alvarez and Haddock (1973), we shall use the following i expression for the density: N(r) = A (r-b) P (1).…”

Section: Introductionmentioning

confidence: 99%

Solar radio burst and in situ determination of interplanetary electron density

1984

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“…Alvarez and Haddock [1973] also calculated these parameters for type IIIs and obtained similar coefficients to those of the LOFAR Type III fit: a = 10.9 × 10 −3 ± 1.1 × 10 −3 and b = 1.84 ± 0.02. The parameters for the type III fit are very close in magnitude to those of the LOFAR S bursts fit suggesting that a similar mechanism is generating these bursts.…”

Section: Resultsmentioning

confidence: 67%

Characteristics of type III radio bursts and solar S bursts

Morosan¹,

Gallagher²

2018

Planetary Radio Emissions Viii

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The Sun is an active source of radio emission which is often associated with the acceleration of electrons arising from processes such as solar flares and coronal mass ejections (CMEs). At low radio frequencies (<100 MHz), numerous solar S bursts (where S stands for short) and storms of type III radio bursts have been observed, that are not directly relates to flares and CMEs. Here, we expand our understanding on the spectral characteristic of these two different types of radio bursts based on observations from the Low Frequency Array (LOFAR). On 9 July 2013, over 3000 solar S bursts accompanied by over 800 type III radio bursts were observed over a time period of ∼8 hours. The characteristics of type III radio bursts presented here are consistent with previous studies. S bursts are shown to be different compared to type III bursts: they show narrow bandwidths, short durations and drift rates of about 1/2 the drift rate of type III bursts. Both type III bursts and solar S bursts occur in a region in the corona where plasma emission is the dominant emission mechanism as determined by data constrained density and magnetic field models.

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Solar wind density model from km-wave type III bursts

Cited by 108 publications

References 15 publications

Simulated Dynamic Spectra: A Group of Coronal Type III Bursts

Simulated Dynamic Spectra: A Group of Coronal Type III Bursts

Solar radio burst and in situ determination of interplanetary electron density

Characteristics of type III radio bursts and solar S bursts

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