Two-Spacecraft Detection of Short-period Decayless Kink Oscillations of Solar Coronal Loops

TL;DR

This study simultaneously captures and analyzes short-period decayless kink oscillations in solar coronal loops using high-resolution imaging from two instruments, confirming the consistency of observations and demonstrating the robustness of data processing techniques.

Contribution

First simultaneous detection of decayless kink oscillations in coronal loops by two high-resolution instruments, validating the use of motion magnification and de-jittering methods.

Findings

Oscillations have periods of 1-3 minutes with amplitudes of 27-83 km.

Signals from two instruments are highly correlated after correcting for light travel time.

HRI detects the same oscillations as AIA, confirming observational consistency.

Abstract

Decayless kink oscillations of an ensemble of loops are captured simultaneously by the High Resolution Imager (HRI) of the Extreme Ultraviolet Imager (EUI) and the Atmospheric Imaging Assembly (AIA) from 22:58 UT on 5 November to 00:27 UT on 6 November 2021. Oscillations are analysed by processing image sequences taken by the two instruments with a motion magnification technique. The analysed loops are around 51 Mm in length, and oscillate with short periods of 1-3 min (1.6 min in average) and displacement amplitudes of 27-83 km. The signals recorded by AIA are delayed by 66 s as compared to HRI, which coincides with the light travel time difference from the Sun to each instrument. After correction of this time difference, the cross-correlation coefficient between the signals from the two data varies from 0.82 to 0.97, indicating that they are well consistent. This work confirms that HRI sees the same oscillations as AIA, which is the necessary first step before proceeding to the detection of shorter time scales by EUI. In addition, our results indicate the robustness of the de-jittering procedure in the study of kink oscillations with HRI.