Abstract
Context. Transverse oscillations of coronal structures are currently intensively studied to explore the associated magnetohydrodynamic wave physics and perform seismology of the local medium. Aims. We make a first attempt to measure the thermodynamic evolution of a sample of coronal loops that undergo decaying kink oscillations in response to an eruption in the corresponding active region. Methods. Using data from the six coronal wavelengths of SDO/AIA, we performed a differential emission measure (DEM) analysis of 15 coronal loops before, during, and after the eruption and oscillation. Results. We find that the emission measure, temperature, and width of the DEM distribution undergo significant variations on timescales relevant for the study of transverse oscillations. There are no clear collective trends of increases or decreases for the parameters we analysed. The strongest variations of the parameters occur during the initial perturbation of the loops, and the influence of background structures may also account for much of this variation. Conclusions. The DEM analysis of oscillating coronal loops in erupting active regions shows evidence of evolution on timescales important for the study of oscillations. Further work is needed to separate the various observational and physical mechanisms that may be responsible for the variations in temperature, DEM distribution width, and total emission measure.
Highlights
Transverse oscillations of coronal loops in erupting active regions have been intensively studied in recent decades
We find that the emission measure, temperature, and width of the differential emission measure (DEM) distribution undergo significant variations on timescales relevant for the study of transverse oscillations
We present a collective analysis of the behaviour of EM, T, and WDEM averaged during phases P1, P2, and P3, defined using the corresponding damping time
Summary
Transverse oscillations of coronal loops in erupting active regions have been intensively studied in recent decades. A recent and comprehensive review can be found in Aschwanden (2019). These waves are considered to be global magnetohydrodynamic (MHD) kink eigenmodes, most commonly detected as the fundamental mode, with an antinode in the vicinity of the loop apex. Recent examples of studies that attempted seismology include Guo et al (2015), Pascoe et al (2016a) and Arregui et al (2019). Anfinogentov & Nakariakov (2019) demonstrated that these waves may be used for seismology of quiet active regions. We note that examples of apparently undamped, or even growing, high-amplitude oscillations associated with eruptive events have been reported We note that examples of apparently undamped, or even growing, high-amplitude oscillations associated with eruptive events have been reported (e.g. Wang et al 2012)
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