The effect of the environment on the P1/P2 period ratio for kink oscillations of coronal loops

Abstract

The P1/P2 period ratio of transversal loop oscillations is currently used for the diagnostics of longitudinal structuring of coronal loops as its deviation from 2 is intrinsically connected to the density scale-height along coronal loops and/or the sub-resolution structure of the magnetic field. The same technique can be applied not only to coronal structures, but also to other oscillating magnetic structures. The oscillations in magnetic structures are described by differential equations whose coefficients depend on the longitudinal structure of the plasma. Using a variational principle written for the transversal component of the velocity vector, developed earlier by McEwan et al. (2008), we investigate how the different temperature of the environment compared to the temperature of the magnetic structure will influence the P1/P2 ratio for typical coronal and prominence conditions. The possible changes are translated into quantities that are used in the process of remote plasma diagnostics in the solar atmosphere.

References in corpus (6)

• First SDO AIA Observations of a Global Coronal EUV "Wave": Multiple Components and "Ripples"
• Observations of Active Region Loops with the EUV Imaging Spectrometer on Hinode
• Large amplitude oscillation of a polar crown filament in the pre-eruption phase
• Global coronal seismology
• Forced oscillations of coronal loops driven by EIT waves
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Cited by in corpus (7)

• Kink oscillations of coronal loops
• MHD Seismology of a Coronal Loop System by the First Two Modes of Standing Kink Waves
• Bayesian Analysis of Multiple Harmonic Oscillations in the Solar Corona
• Do Coronal Loops Oscillate in Isolation?
• Transverse kink oscillations of expanding coronal loops
• Observation of the period ratio P_1/P_2 of transversal oscillations in solar macro-spicules
• Torsional Alfven waves and the period ratio P_1/P_2 in spicules