Spectral-temporal evolution of low-frequency pulsations in the microwave radiation of solar flares

Зайцев, В. В.; Kislyakov, A. G.; Urpo, S.; Stepanov, A. V.; Shkelev, E. I.

doi:10.1134/1.1618999

Cited by 17 publications

(33 citation statements)

References 15 publications

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“…Watari (1996) and Zaitev et al (2003). Even though these methods apprehend some important statistical or geometrical measurement from the data, they present, as PSD, a high bias when it is computed on short time series.…”

Section: For More Technical Details) a Typical Canonicalmentioning

confidence: 99%

“…In the context of solar activity, such structures are associated to non-recurrent high speed streams (HSS) produced by some eruptive solar phenomena such as flares, coronal mass ejections (CMEs) and sudden disappearing filaments. It is well known that non-linear plasma oscillations with solar origin modulate the microwave radiation of solar flares (Zaitev et al, 2003). In the particular scenario of decimetric solar bursts, inhomogeneous plasma turbulence is possibly associated to the coronal plasma configuration where the radio burst is generated.…”

Section: Physical Interpretationmentioning

confidence: 99%

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Fluctuation analysis of solar radio bursts associated with geoeffective X-class flares

Veronese

Rosa

Bolzan

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

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a b s t r a c tHigh temporal resolution solar observations in the decimetric range (1-3 GHz) can provide additional information on solar active regions dynamics and thus contribute to better understanding of solar geoeffective events as flares and coronal mass ejections. The June 6, 2000 flares are a set of remarkable geoeffective eruptive phenomena observed as solar radio bursts (SRB) by means of the 3 GHz Ondrejov Observatory radiometer. We have selected and analyzed, applying detrended fluctuation analysis (DFA), three decimetric bursts associated to X1.1, X1.2 and X2.3 flare-classes, respectively. The association with geomagnetic activity is also reported. DFA method is performed in the framework of a radio burst automatic monitoring system. Our results may characterize the SRB evolution, computing the DFA scaling exponent, scanning the SRB time series by a short windowing before the extreme event. For the first time, the importance of DFA in the context of SRB monitoring analysis is presented.

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Section: For More Technical Details) a Typical Canonicalmentioning

confidence: 99%

Section: Physical Interpretationmentioning

confidence: 99%

Fluctuation analysis of solar radio bursts associated with geoeffective X-class flares

Veronese

Rosa

Bolzan

et al. 2011

Journal of Atmospheric and Solar-Terrestrial Physics

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“…(1) that variations in the loop magnetic field, associated with disturbances of the electric current in a radiating source, should modulate the intensity of the mmradiation of the loop (Zaitsev et al 2003;Khodachenko et al 2005). Another possible origin of the intensity modulation of the observed mm-radiation, which follows from Eq.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, modulations caused by the oscillatory motions of loops that contain the radiation sources, because of their direct connection with the large-scale dynamics of loops, have to have typical frequencies of <0.01 Hz and exhibit no drift. Thus, it has been proposed in Khodachenko et al (2009) Zaitsev et al (1998Zaitsev et al ( , 2003 and Khodachenko et al (2005Khodachenko et al ( , 2009). Therefore, they are not considered here.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the electromagnetic radiation emitted by the Sun comprises an important diagnostic tool for understanding the nature and physics of its dynamic phenomena. In this context, as a relatively novel technique in solar microwave radio astronomy appears to be the analysis of long-periodic (e.g., >1 s) fluctuations in the radiation intensity (Zaitsev et al 2003;Khodachenko et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Possible manifestation of large-scale transverse oscillations of coronal loops in solar microwave emission

Khodachenko

Kislyakova

Zaqarashvili

et al. 2010

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Aims. We interpret long-periodic (minutes) modulations detected in solar microwave emission during flaring events as signatures of large-scale transverse oscillations of coronal loops. Methods. Our data analysis method is based methodologically on a sliding-window Fourier transform combined with the VignerWille technique. We analyze three different events where TRACE detected post-flare oscillating loops (on Mar. 23, 2000; Sep. 15, 2001; Sep. 07, 2001) Results. For the transverse large-scale oscillatory motion of a loop, a properly located observer, in addition to the modulation caused by the emission diagram pattern motion at the main frequency of the loop oscillation, may detect a modulation at twice the frequency, produced by the varying magnetic field during each inclination of the loop. Our main result consists in identification of these "modulation pairs" in the dynamic spectra of solar microwave emission and their association with the observed oscillating coronal loops.

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Stellar Coronal Seismology as a Diagnostic Tool for Flare Plasma

2012

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Spectral-temporal evolution of low-frequency pulsations in the microwave radiation of solar flares

Cited by 17 publications

References 15 publications

Fluctuation analysis of solar radio bursts associated with geoeffective X-class flares

Fluctuation analysis of solar radio bursts associated with geoeffective X-class flares

Possible manifestation of large-scale transverse oscillations of coronal loops in solar microwave emission

Stellar Coronal Seismology as a Diagnostic Tool for Flare Plasma

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