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arXiv · 2610.41343

Spectroscopic observations of periodic bursty ejections during a dome-spire-shaped jet

Heesu Yang·Maria S. Madjarska·Kyoung-Sun Lee·Klaus Galsgaard
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Abstract

Context: The study investigates the complexity of the formation and evolution of a dome-spire-shaped jet (or anemone jet) that originated in an active region and was presumably driven by null-point magnetic reconnection. Aims: We aim to provide a quantitative estimation of multi-temperature plasma dynamics and physical parameters of the jet and its blob-like features, together with its temporal evolution in three-dimensional perspective. Methods: For this, we analyze unique sit-and-stare spectral (Si IV, Mg II k, and C II) and slit-jaw imaging 1400 Å and 2796 Å observations obtained with the Interface Region Imaging Spectrograph (IRIS), with a slit uniquely positioned just above the assumed reconnection site. Co-observations taken with the Fast Imaging Solar Spectrograph of the Goode Solar Telescope in the chromospheric H$α$ and Ca II 8542.10 Å lines were also analyzed. These data are complemented by EUV imaging information from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. Results: The IRIS observations reveal that the jet is formed by multiple periodic ($\sim$30 s) plasma ejections with blob-like appearance, each associated with strongly blueshifted Si IV 1402.77 Å transition-region emission reaching about $-300$ km/s. More importantly, the ejections are grouped into well-defined packets, each lasting approximately 3--5 min. In contrast, only a single Doppler component is observed in the chromospheric Ca II line. Multi-Gaussian decomposition of the Si IV line profiles reveals a highly accelerated plasma, with line-of-sight speed toward the observer increasing linearly from $\sim$30 to 112 km/s over 66 s, corresponding to an acceleration of 1.3 km/s$^2$. The kinetic energy release rate is estimated in the range of $\sim$1.0$\times10^{24}$--1.0$\times10^{25}$ erg\,s$^{-1}$.

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Heesu Yang, Maria S. Madjarska, Kyoung-Sun Lee, Klaus Galsgaard. 2026-10-30. Spectroscopic observations of periodic bursty ejections during a dome-spire-shaped jet. https://arxiv.org/abs/2610.41343

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