Energetic electrons and plasma waves associated with a solar type III radio burst

Lin, R. P.; Potter, D. W.; Gurnett, D. A.; Scarf, F. L.

doi:10.1086/159471

Cited by 362 publications

(241 citation statements)

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“…Such distributions are unstable to the growth of Langmuir waves that in turn can interact with density fluctuations or with other waves to produce radio emission near the local plasma frequency or its harmonic. Unstable electron distributions with simultaneous bursts of Langmuir waves and type III radio emission have been observed (Lin et al 1981), confirming Wild's hypothesis. These escaping electrons will produce also HXR bremsstrahlung emission although at a very low rate due to the low density of the corona.…”

Section: Introductionsupporting

confidence: 73%

Hard X-Rays Associated with Type III Radio Bursts

Christe

Krucker

Lin

2008

ApJ

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During a period of 12 minutes on 2002 July 19 14:23-14:35 UT, the WAVES instrument on WIND observed six interplanetary type III radio bursts, one approximately every 2 minutes, and each was accompanied by a weak hard X-ray (HXR) burst (12-15 keV) observed by RHESSI. The radio bursts are observed up to 150 MHz with some up to 600 MHz. Simultaneous observations by TRACE show jetlike eruptions emanating from the region of HXR emission. The observed HXRs are inconsistent with emission from the escaping type III-producing nonthermal electrons. We suggest that the type III acceleration process may be associated with an explosive release of Շ ergs in the form of a "superhot" (26 MK) thermal plasma in the corona, an energy comparable 26 5 # 10 to that associated with the type III-producing electrons.

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Section: Introductionsupporting

confidence: 73%

Hard X-Rays Associated with Type III Radio Bursts

Christe

Krucker

Lin

2008

ApJ

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“…Astrophysical examples include Type II and III solar radio bursts (Lin et al 1981(Lin et al , 1986Dulk et al 1984;Goldman 1983;Robinson et al 1993aRobinson et al ,b, 1994Reid & Ratcliffe 2014), outer heliospheric radio emission (Kurth et al 1984), and in planetary electron foreshocks (Etcheto & Faucheux 1984;Moses et al 1984;Fuselier et al 1985;Lacombe et al 1985). Related processes in laboratory plasmas have also been discussed by, e.g.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms

Thurgood

Tsiklauri

2015

A&A

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Aims. The simulation of three-wave interaction based plasma emission, thought to be the underlying mechanism for Type III solar radio bursts, is a challenging task requiring fully-kinetic, multi-dimensional models. This paper aims to resolve a contradiction in past attempts, whereby some studies indicate that no such processes occur. Methods. We self-consistently simulate three-wave based plasma emission through all stages by using 2D, fully kinetic, electromagnetic particle-in-cell simulations of relaxing electron beams using the EPOCH2D code.Results. Here we present the results of two simulations;, which we find to permit and prohibit plasma emission respectively. We show that the possibility of plasma emission is contingent upon the frequency of the initial electrostatic waves generated by the bump-in-tail instability, and that these waves may be prohibited from participating in the necessary three-wave interactions due to frequency conservation requirements. In resolving this apparent contradiction through a comprehensive analysis, in this paper we present the first self-consistent demonstration of fundamental and harmonic plasma emission from a single-beam system via fully kinetic numerical simulation. We caution against simulating astrophysical radio bursts using unrealistically dense beams (a common approach which reduces run time), as the resulting non-Langmuir characteristics of the initial wave modes significantly suppresses emission. Comparison of our results also indicates that, contrary to the suggestions of previous authors, an alternative plasma emission mechanism based on two counter-propagating beams is unnecessary in an astrophysical context. Finally, we also consider the action of the Weibel instability which generates an electromagnetic beam mode. As this provides a stronger contribution to electromagnetic energy than the emission, we stress that evidence of plasma emission in simulations must disentangle the two contributions and not simply interpret changes in total electromagnetic energy as evidence of plasma emission.

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“…A linear fit to the velocity dispersion has been commonly applied to study the SPR time of SIEEs (Lin et al 1981;Reames et al 1985;Krucker et al 1999), assuming scatter-free propagation in interplanetary medium (IPM) for the first arriving electrons. The SPR time of electrons with energy E n can be expressed as…”

Section: In Situ Particle Measurementsmentioning

confidence: 99%

Coronal magnetic topology and the production of solar impulsive energetic electrons

Sun

Wang

et al. 2013

A&A

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We investigate two candidate solar sources or active regions (ARs) in association with a solar impulsive energetic electron (SIEE) event on 2002 October 20. The solar particle release (SPR) times of SIEEs are derived by using their velocity dispersion with consideration of the instrumental effect. It is found that there are double electron injections at the Sun. The low-energy ( < ∼ 13 keV) electron injection coincides with a C6.6 flare in AR10154 and is accompanied with prominent type III radio bursts rather than a stronger M1.8 flare in AR10160. The M1.8 flare produces, however, faint type III radio bursts. Electrons of ∼25 to ∼300 keV are released ∼9 min later when a jet-like CME travels to ∼2.6 solar radii. We further examine the coronal magnetic configurations above the two ARs based on the potential field source surface (PFSS) model. It is found that open field lines, rooted in AR10154 and well connected to the Earth, provide escaping channels for energetic electrons. Only a small portion of magnetic fields are opened above AR10160, being responsible for the faint type III radio bursts. These lines are, however, not well connected, making it impossible for SIEEs detection by near-Earth spacecraft. The results appear to establish a physical link between coronal magnetic topology, formation of type III radio bursts, and production of SIEEs.

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Energetic electrons and plasma waves associated with a solar type III radio burst

Cited by 362 publications

References 0 publications

Hard X-Rays Associated with Type III Radio Bursts

Hard X-Rays Associated with Type III Radio Bursts

Self-consistent particle-in-cell simulations of fundamental and harmonic plasma radio emission mechanisms

Coronal magnetic topology and the production of solar impulsive energetic electrons

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