Explosive Events in the Quiet Sun Near and Beyond the Solar Limb Observed with the Interface Region Imaging Spectrograph (IRIS)
C. E. Alissandrakis, J. -C. Vial

TL;DR
This study investigates explosive events in the quiet Sun near the limb using IRIS spectra, revealing their narrow height distribution, dynamic plasma motions, and potential magnetic reconnection origins.
Contribution
It provides detailed spectral analysis of explosive events, showing they occur in a narrow height range and involve rapid, discrete plasma expulsions with possible rotational motions.
Findings
Explosive events occur at about 3.2" above the limb.
Material expelled reaches velocities up to 90 km/s.
Events are likely caused by magnetic reconnection in small loops.
Abstract
We study point-like explosive events (EE), characterized by emission in the far wings of spectral lines, in a quiet region near the South Pole, using Interface Region Imaging Spectrograph (IRIS) spectra at two slit positions, slit-jaw (SJ) observations and Atmospheric Imaging Assembly (AIA) images. The events were best visible in SiIV spectra; they were weak in SJs, occasionally visible in 1600 A and 304 A AIA images, and invisible in higher temperature AIA images. We identified EEs from position--time images in the far wings of the SiIV lines and measured their distance from the limb. A Gaussian model of the height distribution showed that EEs occur in a narrow (0.9") height range, centered at 3.2" above the continuum limb at 2832.0 A. On the disk, we found that they occur in network boundaries. Further, we studied the line profiles of two bright EEs above the limb and one on the disk.…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Laser-induced spectroscopy and plasma · Impact of Light on Environment and Health
