Extreme ultra-violet movie camera for imaging microsecond time scale magnetic reconnection

Chai, Kil-Byoung; Bellan, Paul M.

doi:10.1063/1.4841915

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…First, there is a pronounced dimming of visible light emission at the ripple location as seen in Figure 16a. At the same time and location there is an increase in EUV radiation as reported in Chai and Bellan (2013). The visible light dimming indicates that density is depleted at the RTI location and the enhanced EUV emission indicates simultaneous electron acceleration to high energy followed by collisions with ions to produce ions in highly excited states, the decay of which radiates the EUV emission.…”

Section: Discussion Of the Experiments And Their Main Resultssupporting

confidence: 70%

“…Because whistler waves are at frequencies above the lower hybrid frequency and below the electron cyclotron frequency, whistler waves are in a frequency regime much higher than the MHD frequency regime which consists of frequencies much below the ion cyclotron frequency. Chai and Bellan (2013) observed that there was an enhancement of EUV emission at the location of the RTI, a dimming of visible light emission, and further characterized the emission of whistler radiation. Marshall et al.…”

Section: Discussion Of the Experiments And Their Main Resultsmentioning

confidence: 96%

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Caltech Lab Experiments and the Insights They Provide Into Solar Corona Phenomena

Bellan

2020

JGR Space Physics

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A comprehensive overview of two decades of Caltech experiments relevant to solar corona physics is presented. The extent to which the experiments scale to the solar corona, the basic configurations and operation, and the importance of the magnetic force J × B common to all the experiments is discussed. Summaries are given of the various configurations used, the main observations, and interpretations of these observations, including new models developed to provide these interpretations. Topics include observations and explanations for flux rope self‐collimation, axial flows along flux ropes, eruption of arched flux ropes, strapping magnetic fields that inhibit eruption, the torus instability, and effects such as X‐ray emission of a kink‐driven secondary Rayleigh‐Taylor instability.

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Section: Discussion Of the Experiments And Their Main Resultssupporting

confidence: 70%

Section: Discussion Of the Experiments And Their Main Resultsmentioning

confidence: 96%

Caltech Lab Experiments and the Insights They Provide Into Solar Corona Phenomena

Bellan

2020

JGR Space Physics

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“… A burst of extreme ultraviolet (EUV) radiation is observed coincident with the RT instability (Moser & Bellan 2012). High-speed movies of the EUV radiation indicate that the source of this radiation is situated at the RT instability (Chai & Bellan 2013 a ). Spectroscopic measurements of atomic lines indicate that higher ionization states exist when the RT instability occurs. Capacitive probe measurements show a burst of high-frequency waves (Moser & Bellan 2012).…”

Section: Astrophysical Jet Experimentsmentioning

confidence: 99%

“…High-speed movies of the EUV radiation indicate that the source of this radiation is situated at the RT instability (Chai & Bellan 2013a). …”

Section: Astrophysical Jet Experimentsmentioning

confidence: 99%

Complex astrophysical experiments relating to jets, solar loops, and water ice dusty plasma

et al. 2015

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Recent results of three astrophysically relevant experiments at Caltech are summarized. In the first experiment magnetohydrodynamically driven plasma jets simulate astrophysical jets that undergo a kink instability. Lateral acceleration of the kinking jet spawns a Rayleigh-Taylor instability, which in turn spawns a magnetic reconnection. Particle heating and a burst of waves are observed in association with the reconnection. The second experiment uses a slightly different setup to produce an expanding arched plasma loop which is similar to a solar corona loop. It is shown that the plasma in this loop results from jets originating from the electrodes. The possibility of a transition from slow to fast expansion as a result of the expanding loop breaking free of an externally imposed strapping magnetic field is investigated. The third and completely different experiment creates a weakly ionized plasma with liquid nitrogen cooled electrodes. Water vapour injected into this plasma forms water ice grains that in general are ellipsoidal and not spheroidal. The water ice grains can become quite long (up to several hundred microns) and self-organize so that they are evenly spaced and vertically aligned.

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“…1, the two branches are, respectively, coupled to a lens that captures end-on images of plasma in visible light and to a lens that captures light from an end-on EUV imaging system. 28 The high-speed camera is also used to photograph the plasma in visible light from the side. Time-and space-resolved spectroscopic information is obtained using a vertically aligned 12-channel optical fiber array 29 that views the jet through a vacuum chamber side window at an axial location where the RT instability occurs; assuming local thermodynamic equilibrium (LTE) spectroscopic line ratios indicate that the electron temperature before kinking is T e ¼ 2-3 eV.…”

Section: Experimental Setup and Kink-induced Rt Instabilitymentioning

confidence: 99%

Extreme ultra-violet burst, particle heating, and whistler wave emission in fast magnetic reconnection induced by kink-driven Rayleigh-Taylor instability

2016

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A spatially localized energetic extreme ultra-violet (EUV) burst is imaged at the presumed position of fast magnetic reconnection in a plasma jet produced by a coaxial helicity injection source; this EUV burst indicates strong localized electron heating. A circularly polarized high frequency magnetic field perturbation is simultaneously observed at some distance from the reconnection region indicating that the reconnection emits whistler waves and that Hall dynamics likely governs the reconnection. Spectroscopic measurement shows simultaneous fast ion heating. The electron heating is consistent with Ohmic dissipation, while the ion heating is consistent with ion trajectories becoming stochastic.

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Extreme ultra-violet movie camera for imaging microsecond time scale magnetic reconnection

Cited by 5 publications

References 15 publications

Caltech Lab Experiments and the Insights They Provide Into Solar Corona Phenomena

Caltech Lab Experiments and the Insights They Provide Into Solar Corona Phenomena

Complex astrophysical experiments relating to jets, solar loops, and water ice dusty plasma

Extreme ultra-violet burst, particle heating, and whistler wave emission in fast magnetic reconnection induced by kink-driven Rayleigh-Taylor instability

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