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Non-thermal Broadening of IRIS Fe XXI Line Caused by Turbulent Plasma Flows in the Magnetic Reconnection Region During Solar Eruptions

Reeves, Katharine K.; Polito, Vanessa; Chen, Bin +3 more

Magnetic reconnection is the key mechanism for energy release in solar eruptions, where the high-temperature emission is the primary diagnostic for investigating the plasma properties during the reconnection process. Non-thermal broadening of high-temperature lines has been observed in both the reconnection current sheet (CS) and flare loop-top re…

On orbit performance of the solar flare trigger for the Hinode EUV imaging spectrometer

Warren, Harry P.; Ugarte-Urra, Ignacio; Brooks, David H. +1 more

We assess the on-orbit performance of the flare event trigger for the Hinode EUV Imaging Spectrometer. Our goal is to understand the time-delay between the occurrence of a flare, as defined by a prompt rise in soft X-ray emission, and the initiation of the response observing study. Wide (266″) slit patrol images in the He II 256.32 Å spectral line…

Multi-Scale Variability of Coronal Loops Set by Thermal Non-Equilibrium and Instability as a Probe for Coronal Heating

Antolin, Patrick; Froment, Clara

Solar coronal loops are the building blocks of the solar corona. These dynamic structures are shaped by the magnetic field that expands into the solar atmosphere. They can be observed in X-ray and extreme ultraviolet (EUV), revealing the high plasma temperature of the corona. However, the dissipation of magnetic energy to heat the plasma to millio…

Subarcsecond Imaging of a Solar Active Region Filament With ALMA and IRIS

Heinzel, P.; Gunár, S.; Leenaarts, J. +4 more

Quiescent filaments appear as absorption features on the solar disk when observed in chromospheric lines and at continuum wavelengths in the millimeter (mm) range. Active region (AR) filaments are their small-scale, low-altitude analogues, but they could not be resolved in previous mm observations. This spectral diagnostic can provide insight into…

An ALMA Observation of Time Variations in Chromospheric Temperature of a Solar Plage Region

Shimojo, Masumi; Shimizu, Toshifumi; Abe, Masashi

Nanoflares and the shock formation of magnetohydrodynamic waves in the solar chromosphere have been considered as key physical mechanisms of the heating of the chromosphere and corona. To investigate candidates of their signature in the mm-wavelength, a tiny active region located on the solar disk was observed with the Atacama Large millimeter and…

Evidence for a Magnetic Flux Rope in Observations of a Solar Prominence-Cavity System

Reeves, Katharine K.; Su, Yingna; Jibben, Patricia R.