Abstracts Details


First Name * : Nancy
Last Name * : Narang
Affiliation * : Indian Institute of Astrophysics, Bangalore, India
Abstract Type * : Oral
Title * : High-frequency dynamics of an active region moss as observed by IRIS
Author(s) * : Narang, Nancy; Pant, Vaibhav; Banerjee, Dipankar; Van Doorsselaere, Tom
Abstract Session * : Chromospheric dynamics
Abstract * : The high temporal, spatial and spectral resolution of Interface Region Imaging Spectrograph (IRIS) has provided new insights into the understanding of different small-scale processes occurring at the chromospheric and transition region (TR) heights. We study the dynamics of high-frequency oscillations of an active region (AR 2376) moss as recorded by simultaneous imaging and spectral data of IRIS. Wavelet transformation, power maps generated from slit-jaw images in Si IV 1400 Å passband, and sit-and-stare spectroscopic observations of Si IV 1403 Å spectral line reveal the presence of high-frequency oscillations with ~1-2 minutes periods in the bright moss regions. The presence of such low periodicities is further confirmed by intrinsic mode functions (IMFs) as obtained by empirical mode decomposition (EMD) technique. We find the evidence of the presence of slow waves and reconnection-like events, and together they cause the high-frequency oscillations in the bright moss regions.