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Harmonic oscillations of the X-ray emission of a solar flare

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Abstract

An analysis is presented for the class-M9.3 solar flare of November 6, 2004, whose decay phase displayed weakly damped harmonic oscillations of the predominantly thermal X-ray flux detected by the RHESSI spacecraft (at energies ≲25 keV). The period of these oscillations was ≈78 s, and their characteristic decay time ≈100 min. Similar quasi-periodic pulsations were observed in the decimeter-centimeter radio flux (pulsations of a type-IV radio outburst), but were less pronounced in the non-thermal hard X-ray flux (≳25 keV). The area of the quasi-stationary X-ray source, which was located primarily at the apex of a set of flare loops (≲15 keV) that were cooled primarily via thermal conduction, was found to be in anti-phase with the oscillating X-ray flux it emitted. The observed oscillations are interpreted as harmonic modulations of the radiation flux emitted by the heated thermal flare-loop plasma, due to the global, standing, sausage mode of fast magnetoacoustic waves excited in the loop.

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Authors and Affiliations

  1. Space Research Institute, Russian Academy of Sciences, Moscow, Russia

    I. V. Zimovets

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Original Russian Text © I.V. Zimovets,, 2010, published in Astronomicheskiĭ Zhurnal, 2010, Vol. 87, No. 7, pp. 717–736.

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Zimovets, I.V. Harmonic oscillations of the X-ray emission of a solar flare. Astron. Rep. 54, 657–674 (2010). https://doi.org/10.1134/S1063772910070097

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