Remote coronal dimmings related to a circular-ribbon flare

Zhang, Q. M.; Zheng, Ruisheng

doi:10.1051/0004-6361/201937126

Cited by 6 publications

(3 citation statements)

References 46 publications

(58 reference statements)

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“…Note that some dimmings are likely not associated with CMEs, e.g. long-duration remote dimmings associated with confined circular-ribbon flares (Zhang and Zheng, 2020) and dimmings at the peripheries of emerging flux regions (Zhang et al, 2012). Here we focus on CME-induced dimmings.…”

Section: Upflows From Cme-induced Dimmingsmentioning

confidence: 99%

Upflows in the Upper Solar Atmosphere

et al. 2021

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Spectroscopic observations at extreme-and far-ultraviolet wavelengths have revealed systematic upflows in the solar transition region and corona. These upflows are best seen in the network structures of the quiet Sun and coronal holes, boundaries of active regions, and dimming regions associated with coronal mass ejections. They have been intensively studied in the past two decades because they are likely to be closely related to the formation of the solar wind and heating of the upper solar atmosphere. We present an overview of the characteristics of these upflows, introduce their possible formation mechanisms, and discuss their potential roles in the mass and energy transport in the solar atmosphere. Although past investigations have greatly improved our understanding of these upflows, they have left us with several outstanding questions and unresolved issues that should be addressed in the future. New observations from the Solar Orbiter mission, the Daniel K. Inouye Solar Telescope and the Parker Solar Probe will likely provide critical information to advance our understanding of the generation, propagation, and energization of these upflows.

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Section: Upflows From Cme-induced Dimmingsmentioning

confidence: 99%

Upflows in the Upper Solar Atmosphere

et al. 2021

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“…Panels (b) and (c) draw the local images at around 05:30 UT (green vertical line in panel a) in Hα and AIA 211 Å, respectively. They have the same FOV and display a circular profile, indicating a followed circular-ribbon flare (see, Zhang et al 2019;Zhang & Zheng 2020). The whole evolution from ∼05:01 UT to ∼06:20 UT can be seen in the accompanying video, anim.mp4.…”

Section: Observationsmentioning

confidence: 96%

Preflare very long-periodic pulsations observed in Halpha emission before the onset of a solar flare

Li,

Feng,

et al. 2020

Preprint

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Context. Very long-periodic pulsations during preflare phases (preflare-VLPs) have been detected in the full-disk solar soft X-Ray (SXR) flux (see Tan et al. 2016). They may be regarded as precursors to solar flares and may help us better understand the trigger mechanism of solar flares. Aims. In this letter, we report a preflare-VLP event prior to the onset of an M1.1 circular-ribbon flare on 2015 October 16. It was simultaneously observed in Hα, SXR, and extreme ultraviolet (EUV) wavelengths. Methods. The SXR fluxes in 1−8 Å and 1−70 Å were recorded by the Geostationary Operational Environmental Satellite (GOES) and Extreme Ultraviolet Variability Experiment (EVE), respectively; the light curves in Hα and EUV 211 Å were integrated over a small local region, which were measured by the 1m New Vacuum Solar Telescope (NVST) and the Atmospheric Imaging Assembly (AIA), respectively. The preflare-VLP is identified as the repeat and quasi-periodic pulses in light curves during preflare phase. The quasi-periodicity can be determined from the Fourier power spectrum with Markov chain Monte Carlo (MCMC)-based Bayesian (e.g., Liang et al. 2020). Results. Seven well-developed pulses are found before the onset of an M1.1 circular-ribbon flare. They are firstly seen in the local light curve in Hα emission and then discovered in full-disk SXR fluxes in GOES 1−8 Å and ESP 1−70 Å, as well as the local light curve in AIA 211 Å. These well-developed pulses can be regarded as the preflare-VLP, which might be modulated by LRC-circuit oscillation in the current-carrying plasma loop. The quasi-period is estimated to be ∼9.3 minutes. Conclusions. We present the first report of a preflare-VLP event in the local Hα line and EUV wavelength, which could be considered a precursor of a solar flare. This finding should therefore prove useful for the prediction of solar flares, especially for powerful flares.

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“…Panels b and c draw the local images at around 05:30 UT (green vertical line in panel a) in Hα and AIA 211 Å, respectively. They have the same FOV and display a circular profile, indicating a followed circular-ribbon flare (see, Zhang et al 2019;Zhang & Zheng 2020). The whole evolution from ∼05:01 UT to ∼06:20 UT can be seen in the online video, anim.mp4.…”

Section: Observationsmentioning

confidence: 98%

Preflare very long-periodic pulsations observed in Hα emission before the onset of a solar flare

Liu

Feng

et al. 2020

A&A

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Context. Very long-periodic pulsations during preflare phases (preflare-VLPs) have been detected in the full-disk solar soft X-ray (SXR) flux. They may be regarded as precursors to solar flares and may help us better understand the trigger mechanism of solar flares. Aims. In this Letter, we report a preflare-VLP event prior to the onset of an M1.1 circular-ribbon flare on 2015 October 16. It was simultaneously observed in Hα, SXR, and extreme ultraviolet (EUV) wavelengths. Methods. The SXR fluxes in 1−8 Å and 1−70 Å were recorded by the Geostationary Operational Environmental Satellite (GOES) and Extreme Ultraviolet Variability Experiment, respectively; the light curves in Hα and EUV 211 Å were integrated over a small local region, which were measured by the 1 m New Vacuum Solar Telescope and the Atmospheric Imaging Assembly (AIA), respectively. The preflare-VLP is identified as the repeat and quasi-periodic pulses in light curves during preflare phase. The quasi-periodicity can be determined from the Fourier power spectrum with Markov chain Monte Carlo-based Bayesian. Results. Seven well-developed pulses are found before the onset of an M1.1 circular-ribbon flare. They are firstly seen in the local light curve in Hα emission and then discovered in full-disk SXR fluxes in GOES 1−8 Å and ESP 1−70 Å, as well as the local light curve in AIA 211 Å. These well-developed pulses can be regarded as the preflare-VLP, which might be modulated by LRC-circuit oscillation in the current-carrying plasma loop. The quasi-period is estimated to be ∼9.3 min. Conclusions. We present the first report of a preflare-VLP event in the local Hα line and EUV wavelength, which could be considered a precursor of a solar flare. This finding should therefore prove useful for the prediction of solar flares, especially for powerful flares.

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Remote coronal dimmings related to a circular-ribbon flare

Cited by 6 publications

References 46 publications

Upflows in the Upper Solar Atmosphere

Upflows in the Upper Solar Atmosphere

Preflare very long-periodic pulsations observed in Halpha emission before the onset of a solar flare

Preflare very long-periodic pulsations observed in Hα emission before the onset of a solar flare

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