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High-frequency dynamics of active region moss as observed by IRIS View all abstracts by submitter

Vaibhav Pant   Submitted: 2019-05-03 03:40

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 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 the Si IV 1400Å passband, and sit-and-stare spectroscopic observations of the Si IV 1403Å spectral line reveal the presence of high-frequency oscillations with ∼1-2 minute periods in the bright moss regions. The presence of such low periodicities is further confirmed by intrinsic mode functions (IMFs) as obtained by the empirical mode decomposition (EMD) technique. We find evidence of the presence of slow waves and reconnection-like events, and together they cause the high-frequency oscillations in the bright moss regions.

Authors: Nancy Narang, Vaibhav Pant, Dipankar Banerjee, Tom Van Doorsselaere
Projects: IRIS

Publication Status: Frontiers in Astronomy and Space Sciences (in press)
Last Modified: 2019-05-03 16:03
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