Coronal Jets as a Cause of Microwave Negative Bursts

Kuzmenko, I. V.

doi:10.12737/stp-63202003

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…Negative-burst events caused by the screening of near-limb radio sources by the jet matter were already reported in [7,8]. A similar picture was observed on September 7-9, 2017.…”

Section: Discussionsupporting

confidence: 77%

“…The type of negative burst depended on the class of the flare preceding the jet or following it. The depression of radio emission could even be an "isolated" negative burst if the flare class was low and the active region was close to the solar limb (such as, for example, the third negative burst in the event of September 8-9, 2017 or the radio emission depressions studied in [8]). Although, as a such a burst is observed in the absence of any flares, as in the event of November 15-16, 2015. It was previously noted that negative bursts in the microwave range are quite rare.…”

Section: Discussionmentioning

confidence: 99%

“…The study of some negative burst events based on data from different spectral ranges showed that the depressions of radio emission were mainly caused by the absorption of radiation from local radio sources and vast regions of the quiet Sun by low-temperature plasma of an eruptive filament [1][2][3][4][5][6]. Negative bursts also occurred as a result of screening of bright near-limb radio sources by the material of jet-like eruptions [7,8]. Recall that jets are small-scale solar plasma ejections observed in the extreme ultraviolet (EUV) and X-ray ranges.…”

Section: Introductionmentioning

confidence: 99%

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Quiet-Filament Eruptions and Coronal Jets as Causes of Depressions in Microwave Radio Emission

Kuzmenko

2021

Astron. Rep.

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Several solar events with different types of negative microwave bursts have been studied using data from different spectral ranges. The total radio flux data obtained at the Ussuriysk Observatory, the Nobeyama Observatory, the US Air Force Radio Solar Telescope Network (RSTN), and the spectropolarimeter of the Institute of Solar–Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences (ISTP SB RAS) were used. The images were analyzed using data from the SDO/AIA space observatory in the 304 Å channel and the Nobeyama radio heliograph at a frequency of 17 GHz. It was shown that the “isolated” depressions of radio emission were caused by the absorption of radiation from radio sources and/or vast regions of the quiet Sun by low-temperature material of a large eruptive filament in the absence of flares. This confirmed the conclusions of the previous studies. It was revealed that the cause of negative bursts of the “pre-burst depression” type was the screening of a near-limb radio source by the material of coronal jets. In the case of a weak flare accompanying the jet, the negative burst could also be of the “isolated” type. A case of a previously unreported occurrence of a deeper depression of radio emission at high frequencies as compared to low frequencies was considered. It was shown that negative bursts are not as rare phenomena as previously thought.

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“…Negative-burst events caused by the screening of near-limb radio sources by the jet matter were already reported in [7,8]. A similar picture was observed on September 7-9, 2017.…”

Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quiet-Filament Eruptions and Coronal Jets as Causes of Depressions in Microwave Radio Emission

Kuzmenko

2021

Astron. Rep.

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Diagnostics of plasma jets in the solar corona

Anfinogentov

Kaltman

Stupishin

et al. 2021

Solar-Terrestrial Physics

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The paper discusses the diagnostics of plasma jets in the solar corona with the use of data from modern space- and ground-based telescopes observing the Sun in the extreme ultraviolet (EUV) and micro- wave bands. We examine observational parameters of EUV and radio emission in events associated with plasma jets, depending on the mechanism of formation, initiation conditions, and evolution of the jets. The opportunities provided by the study of plasma jets, which relies on simultaneous observations in different bands, are highlighted. For a number of jets, we have measured their primary parameters; and in this paper we present preliminary results of statistical processing of the data obtained. Microwave observations of several specific events, made by ground-based instruments RATAN-600, SRH, and Nobeyama Radioheliograph, are considered in detail. The diagnostic capabilities of these instruments for studying coronal jets are shown. To analyze the three-dimensional structure of the coronal magnetic field, we have used SDO/HMI data, which allowed for the reconstruction of the field in the lower corona. The information gained is compared with the results of diagnostics of the magnetic field at the base of the corona according to RATAN-600 data. The purpose of the methods developed is to determine the physical mechanisms responsible for the generation, collimation, and dynamics of plasma jets in the solar atmosphere.

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Coronal Jets as a Cause of Microwave Negative Bursts

Cited by 2 publications

References 17 publications

Quiet-Filament Eruptions and Coronal Jets as Causes of Depressions in Microwave Radio Emission

Quiet-Filament Eruptions and Coronal Jets as Causes of Depressions in Microwave Radio Emission

Diagnostics of plasma jets in the solar corona

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