Multiwavelength Imaging and Spectral Analysis of Jet-like Phenomena in a Solar Active Region Using IRIS and AIA

TL;DR

This study analyzes jet-like phenomena in a solar active region using IRIS and AIA data, revealing high-speed jets with signatures across multiple wavelengths, likely driven by wave shock mechanisms.

Contribution

It provides detailed imaging and spectral analysis of solar jets, proposing a wave-based mechanism for their origin, which advances understanding of solar atmospheric dynamics.

Findings

Jets exhibit Doppler speeds of ±10-22 km/s.

Plane-of-sky speeds range from 23-130 km/s.

Jets last about 15 minutes and occur multiple times over 2 hours.

Abstract

High-resolution observations of dynamic phenomena give insight into properties and processes that govern the low solar atmosphere. We present the analysis of jet-like phenomena emanating from a penumbral foot-point in active region (AR) 12192 using imaging and spectral observations from the Interface Region Imaging Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. These jets are associated with line-of-sight (LoS) Doppler speeds of $\pm$ 10-22 km s$^{-1}$ and bright fronts which seem to move across the Plane-of-Sky (PoS) at speeds of 23-130 km s$^{-1}$. Such speeds are considerably higher than the expected sound speed in the chromosphere. The jets have signatures which are visible both in the cool and hot channels of IRIS and AIA. Each jet lasts on average 15 minutes and occur 5-7 times over a period of 2 hours. Possible mechanisms to explain this phenomenon are suggested, the most likely of which involve p-mode or Alfv\' en wave shock trains impinging on the transition region (TR) and corona as a result of steepening photospheric wavefronts or gravity waves.