Two Successive Type II Radio Bursts Associated With B-Class Flares and Slow CMEs

Ma, Suli; Chen, Huadong

doi:10.3389/fspas.2020.00017

Cited by 4 publications

(3 citation statements)

References 58 publications

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“…Our findings show that the type II radio burst is associated with a blowout jet that does not evolve into a CME. The starting frequency of the radio bursts is in the range of 200-250 MHz, which is larger than those of CME-driven type II radio bursts found in many previous studies (e.g., Cho et al 2007Cho et al , 2008Feng et al 2013;Chen et al 2014;Ma & Chen 2020;Jebaraj et al 2021;Ramesh et al 2023). This could be the difference between jet-driven type II radio bursts and CME-driven type II radio bursts.…”

Section: Discussionmentioning

confidence: 55%

“…Based on their findings, they proposed that the band-splitting signals are moderately polarized with left-handed polarized emission stronger than the right-hand one. It is commonly believed that coronal shocks result from the coronal mass ejection (CME) propagation or expansion (e.g., Cliver et al 2004;Vršnak & Cliver 2008;Liu et al 2009;Chen 2011;Li et al 2012;Shen & Liu 2012;Cho et al 2013;Feng et al 2013;Chen et al 2014;Ying et al 2018;Ma & Chen 2020;Lu et al 2022;Zhang et al 2022b).…”

Section: Introductionmentioning

confidence: 99%

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A Type II Radio Burst Driven by a Blowout Jet on the Sun

Hou

Madjarska

et al. 2023

ApJ

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Type II radio bursts are often associated with coronal shocks that are typically driven by coronal mass ejections (CMEs) from the Sun. Here we conduct a case study of a type II radio burst that is associated with a C4.5-class flare and a blowout jet, but without the presence of a CME. The blowout jet is observed near the solar disk center in the extreme-ultraviolet (EUV) passbands with different characteristic temperatures. Its evolution involves an initial phase and an ejection phase with a velocity of 560 ± 87 km s−1. Ahead of the jet front, an EUV wave propagates at a projected velocity of ∼403 ± 84 km s−1 in the initial stage. The velocity of the type II radio burst is estimated to be ∼641 km s−1, which corresponds to the shock velocity against the coronal density gradient. The EUV wave and the type II radio burst are closely related to the ejection of the blowout jet, suggesting that both are likely the manifestation of a coronal shock driven by the ejection of the blowout jet. The type II radio burst likely starts lower than those associated with CMEs. The combination of the velocities of the radio burst and the EUV wave yields a modified shock velocity at ∼757 km s−1. The Alfvén Mach number is in the range of 1.09–1.18, implying that the shock velocity is 10%–20% larger than the local Alfvén velocity.

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Section: Discussionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

A Type II Radio Burst Driven by a Blowout Jet on the Sun

Hou

Madjarska

et al. 2023

ApJ

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“…[Vršnak, 2019] studied the pre-eruptive gradual rise of flux ropes with an analytical model, considering three different driving processes. [Ma and Chen, 2020] investigated two Type II radio bursts associated with three slow CMEs. [Mishra et al, 2020] made an effort to extrapolate the internal thermodynamic properties of a CME flux rope near the Sun to 1 AU by using a model constrained by the CME kinematics.…”

Section: Editorial On the Research Topicmentioning

confidence: 99%

Editorial: Magnetic Flux Ropes: From the Sun to the Earth and Beyond

Zhang

Wang

et al. 2020

Front. Astron. Space Sci.

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Type II radio bursts and their association with coronal mass ejections in solar cycles 23 and 24

Kumari¹,

Morosan²,

Kilpua³

et al. 2023

A&A

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Context. Meter-wavelength type II solar radio bursts are thought to be the signatures of shock-accelerated electrons in the corona. Studying these bursts can give information about the initial kinematics, dynamics, and energetics of coronal mass ejections (CMEs) in the absence of white-light observations. Aims. We investigate the occurrence of type II bursts in solar cycles 23 and 24 and their association with CMEs. We also explore whether type II bursts might occur in the absence of a CME. Methods. We performed a statistical analysis of type II bursts that occurred between 200 and 25 MHz in solar cycles 23 and 24 and determined the temporal association of these radio bursts with CMEs. We categorized the CMEs based on their linear speed and angular width and studied the distribution of type II bursts with fast (≥500 km s−1), slow (< 500 km s−1), wide (≥60°), and narrow (< 60°) CMEs. We explored the dependence of type II bursts occurrence on the phases of the solar cycle. Results. Our analysis shows that during solar cycles 23 and 24, 768 and 435 type II bursts occurred, respectively. Of these, 79% were associated with CMEs in solar cycle 23, and 95% were associated with CMEs in solar cycle 24. However, only 4% and 3% of the total number of CMEs were accompanied by type II bursts in solar cycle 23 and 24, respectively. Most of the type II bursts in both cycles were related to fast and wide CMEs (48%). We also determined the typical drift rate and duration for type II bursts, which is 0.06 MHz s−1 and 9 min. Our results suggest that type II bursts dominate at heights ≈1.7 − 2.3 ± 0.3 R⊙. A clear majority have an onset height around 1.7 ± 0.3 R⊙ assuming the four-fold Newkirk model. Conclusions. The results indicate that most of the type II bursts had a white-light CME counterpart, but a few type II bursts lacked a clear CME association. There were more CMEs in cycle 24 than in cycle 23. However, cycle 24 contained fewer type II radio bursts than cycle 23. The onset heights of type II bursts and their association with wide CMEs reported in this study indicate that the early lateral expansion of CMEs may play a key role in the generation of these radio bursts.

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Two Successive Type II Radio Bursts Associated With B-Class Flares and Slow CMEs

Cited by 4 publications

References 58 publications

A Type II Radio Burst Driven by a Blowout Jet on the Sun

A Type II Radio Burst Driven by a Blowout Jet on the Sun

Editorial: Magnetic Flux Ropes: From the Sun to the Earth and Beyond

Type II radio bursts and their association with coronal mass ejections in solar cycles 23 and 24

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