Type III Radio Bursts Observations on 20th August 2017 and 9th September 2017 with LOFAR Bałdy Telescope

Dąbrowski, Bartosz; Flisek, Paweł; Mikuła, Katarzyna; Froń, Adam; Vocks, C.; Magdalenić, Jasmina; Krankowski, Andrzej; Zhang, Peijin; Zucca, Pietro; Mann, G.

doi:10.3390/rs13010148

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…The error of the average drift rate is computed as the standard deviation of the drift rate at the frequencies that were determined earlier. On the basis of the obtained drift rates we determined the velocity and energy of electrons responsible for generation of the analyzed bursts (e.g., Dabrowski et al 2021). The reason for using the maxima of the bursts rather than their leading edges was the extremely irregular shape of the edges.…”

Section: Observations and Data Analysismentioning

confidence: 99%

Interferometric imaging of the type IIIb and U radio bursts observed with LOFAR on 22 August 2017

Dąbrowski

Mikuła

Flisek

et al. 2023

A&A

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Context. The Sun is the source of different types of radio bursts that are associated with solar flares, for example. Among the most frequently observed phenomena are type III solar bursts. Their radio images at low frequencies (below 100 MHz) are relatively poorly studied due to the limitations of legacy radio telescopes. Aims. We study the general characteristics of types IIIb and U with stria structure solar radio bursts in the frequency range of 20–80 MHz, in particular the source size and evolution in different altitudes, as well as the velocity and energy of electron beams responsible for their generation. Methods. In this work types IIIb and U with stria structure radio bursts are analyzed using data from the LOFAR telescope including dynamic spectra and imaging observations, as well as data taken in the X-ray range (GOES and RHESSI satellites) and in the extreme ultraviolet (SDO satellite). Results. In this study we determined the source size limited by the actual shape of the contour at particular frequencies of type IIIb and U solar bursts in a relatively wide frequency band from 20 to 80 MHz. Two of the bursts seem to appear at roughly the same place in the studied active region and their source sizes are similar. It is different in the case of another burst, which seems to be related to another part of the magnetic field structure in this active region. The velocities of the electron beams responsible for the generation of the three bursts studied here were also found to be different.

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Section: Observations and Data Analysismentioning

confidence: 99%

Interferometric imaging of the type IIIb and U radio bursts observed with LOFAR on 22 August 2017

Dąbrowski

Mikuła

Flisek

et al. 2023

A&A

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“…The next two papers concern the applications of the radio-telescopes being a part of the international network called LOFAR (LOw-Frequency ARray for radio astronomy). The first of them "Type III Radio Bursts Observations on 20 August 2017 and 9 September 2017 with LOFAR Bałdy Telescope" [6] by B. Dabrowski, P. Flisek, K. Mikuła, A. Froń, C. Vocks, J. Magdalenić, A. Krankowski, P. Zhang, P. Zucca and G. Mann, reports the analysis of two solar radio events of type III burst [7], observed at the LOFAR station in the observatory in Bałdy (Poland), occurred in 2017. The study is performed by using several instrumentations (LOFAR, IRIS, SDO) and it is detailed in a clear way, and can be understood even by non-expert readers in the solar physics, thus becoming very useful for students and young radio researchers..…”

Section: Overview Of the Papers Published In The Special Issuementioning

confidence: 99%

Microwave and Radar Week (MRW 2020): Selected Papers

2021

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“…In the last few years, we witnessed the emergence of modern instruments, such as LOFAR and PSP, that allowed to observe solar radio emissions with higher sensitivity from a better vantage point. Although type III bursts have been extensively studied (Dabrowski et al 2021), there are still some unresolved issues regarding the exact mechanism of type III emissions. For example, it is not yet clear how the electrons are accelerated to the high energies required to generate type III radio bursts, or what role the coronal magnetic field plays in this process.…”

Section: Introductionmentioning

confidence: 99%

Coronal Diagnostics of Solar Type-III Radio Bursts Using LOFAR and PSP Observations

Nedal¹,

Kozarev²,

Zhang³

et al. 2023

Preprint

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<p>Understanding the physical processes underlying solar radio bursts requires both high- and low-frequency observations, as well as imaging capabilities. In this study, we implement a fully automated approach to detect and characterize type III radio bursts, image their sources in the corona, and characterize the plasma environment where the bursts are triggered. We utilize data from the Low-Frequency Array (LOFAR) and the Parker Solar Probe (PSP) to investigate several type-III radio bursts that occurred on April 3, 2019. Through data pre-processing and combining the LOFAR and PSP dynamic spectra, we study the solar radio emissions between 2.6 kHz and 80 MHz. By extracting the frequency drift and speed of the accelerated electron beams, we gain insight into the physical processes driving these bursts. Additionally, by using LOFAR interferometric observations to image the sources of the radio emission at multiple frequencies, we are able to determine the locations and kinematics of the sources in the corona. We also use Potential Field Source Surface (PFSS) modeling and magnetohydrodynamic (MHD) simulation results to determine the magnetic field configuration and plasma parameters in the vicinity of the moving emission sources. These observations and analysis provide valuable constraints on the coronal conditions that trigger solar radio bursts.</p>

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Type III Radio Bursts Observations on 20th August 2017 and 9th September 2017 with LOFAR Bałdy Telescope

Cited by 6 publications

References 21 publications

Interferometric imaging of the type IIIb and U radio bursts observed with LOFAR on 22 August 2017

Interferometric imaging of the type IIIb and U radio bursts observed with LOFAR on 22 August 2017

Microwave and Radar Week (MRW 2020): Selected Papers

Coronal Diagnostics of Solar Type-III Radio Bursts Using LOFAR and PSP Observations

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