Quasi-Periodic Pulsations in an M-Class Solar Flare

Xu, Jun; Ning, Zhouyu; Li, D.; Shi, Fanpeng

doi:10.3390/universe9050215

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…The flare QPPs were also seen in the Lyα emission (Milligan et al 2017;Li et al 2021;Lu et al 2021). The quasiperiods of flare QPPs were observed in a wide range of timescales of minutes, seconds, or even milliseconds (e.g., Sych et al 2009;Tan et al 2010;Kumar et al 2015;Karlický & Rybák 2020;Xu et al 2023;Zhao et al 2023;Millar et al 2024). It seems that the detected period is highly associated with the observed wave band or the used instrument.…”

Section: Introductionmentioning

confidence: 93%

Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare

Li,

Hong,

Hou

et al. 2024

ApJ

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We report the simultaneous observations of quasiperiodic pulsations (QPPs) in wavelengths of hard X-ray (HXR), microwave, Lyα, and ultraviolet (UV) emissions during the impulsive phase of an X6.4 flare on 2024 February 22 (SOL2024-02-22T22:08). The X6.4 flare shows three repetitive and successive pulsations in HXR and microwave wavebands, and they have an extremely large modulation depth. The onset of flare QPPs is almost simultaneous with the start of magnetic cancellation between positive and negative fields. The wavelet power spectra suggest the presence of double periods, which are centered at ∼200 and ∼95 s, respectively. The long-period QPP can also be detected in Lyα and UV wavebands at the flare area, and it could be observed in the adjacent sunspot. Our observations indicate that the flare QPPs are most likely triggered by accelerated electrons that are associated with periodic magnetic reconnections. The long period at ∼200 s is probably modulated by the slow magnetoacoustic wave originating from the neighboring sunspot, while the short period at ∼95 s could be regarded as its second harmonic mode.

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Section: Introductionmentioning

confidence: 93%

Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare

Li,

Hong,

Hou

et al. 2024

ApJ

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“…Some work has aimed to identify the spatial locations of the modulations [e.g. 15,31,[34][35][36], although they are limited temporal cadences, and the spatially diagnostics; for example only spatially observing along the slit position. In order to correctly identify the mechanism producing QPPs, characteristics of the temporal, spatial and spectral properties of pulsations and their relationships across energy ranges and temperatures are required.…”

Section: Of 25mentioning

confidence: 99%

SISA: The First Extreme-Ultraviolet Solar Integral Field Spectrograph Using Slicers

Calcines Rosario,

Reid,

Matthews

et al. 2023

Preprint

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Particle acceleration, and the thermalisation of energetic particles, are fundamental processes across the universe. Whilst the Sun is an excellent object to study this phenomenon, since it is the most energetic particle accelerator in the Solar System, this phenomenon arises in many other astrophysical objects, such as active galactic nuclei, black holes, neutron stars, gamma ray bursts, solar and stellar coronae, accretion disks and planetary magnetospheres. Observations in the Extreme Ultraviolet (EUV) are essential for these studies but can only be made from space. Current spectrographs operating in the EUV use an entrance slit and cover the required field of view using a scanning mechanism. This results in a relatively slow image cadence on the order of minutes to capture inherently rapid and transient processes, and/or in the spectrograph slit `missing the action'. The application of image slicers for EUV integral field spectrographs is therefore revolutionary. The development of this technology will enable observations of EUV spectra from an entire 2D field of view in seconds, over two orders of magnitude faster than what is currently possible. The Spectral Imaging of the Solar Atmosphere (SISA) instrument is the first integral field spectrograph proposed for observations at 180A combining the image slicer technology and curved diffraction gratings in a highly efficient and compact layout, while providing important spectroscopic diagnostics for characterization of solar coronal and flare plasmas. SISA's characteristics, main challenges and the on-going activities to enable the image slicer technology for EUV applications are presented in this paper.

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“…Some work has aimed to identify the spatial locations of the modulations, e.g., Refs. [22,37,[40][41][42], although there are limits to the temporal cadences and spatial diagnostics, for example, there is only spatial observation along the slit position. In order to correctly identify the mechanism producing QPPs, the characteristics of the temporal, spatial, and spectral properties of pulsations and their relationships across energy ranges and temperatures are required.…”

mentioning

confidence: 99%

Spectral Imager of the Solar Atmosphere: The First Extreme-Ultraviolet Solar Integral Field Spectrograph Using Slicers

Calcines Rosario,

Auchère,

Corso

et al. 2024

Aerospace

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Particle acceleration, and the thermalisation of energetic particles, are fundamental processes across the universe. Whilst the Sun is an excellent object to study this phenomenon, since it is the most energetic particle accelerator in the Solar System, this phenomenon arises in many other astrophysical objects, such as active galactic nuclei, black holes, neutron stars, gamma ray bursts, solar and stellar coronae, accretion disks and planetary magnetospheres. Observations in the Extreme Ultraviolet (EUV) are essential for these studies but can only be made from space. Current spectrographs operating in the EUV use an entrance slit and cover the required field of view using a scanning mechanism. This results in a relatively slow image cadence in the order of minutes to capture inherently rapid and transient processes, and/or in the spectrograph slit ‘missing the action’. The application of image slicers for EUV integral field spectrographs is therefore revolutionary. The development of this technology will enable the observations of EUV spectra from an entire 2D field of view in seconds, over two orders of magnitude faster than what is currently possible. The Spectral Imaging of the Solar Atmosphere (SISA) instrument is the first integral field spectrograph proposed for observations at ∼180 Å combining the image slicer technology and curved diffraction gratings in a highly efficient and compact layout, while providing important spectroscopic diagnostics for the characterisation of solar coronal and flare plasmas. SISA’s characteristics, main challenges, and the on-going activities to enable the image slicer technology for EUV applications are presented in this paper.

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Quasi-Periodic Pulsations in an M-Class Solar Flare

Cited by 3 publications

References 56 publications

Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare

Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare

SISA: The First Extreme-Ultraviolet Solar Integral Field Spectrograph Using Slicers

Spectral Imager of the Solar Atmosphere: The First Extreme-Ultraviolet Solar Integral Field Spectrograph Using Slicers

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