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Invited Review: Short-term Variability with the Observations from the Helioseismic and Magnetic Imager (HMI) Onboard the Solar Dynamics Observatory (SDO): Insights into Flare Magnetism
Kazachenko, Maria D.; Welsch, Brian T.; Albelo-Corchado, Marcel F. +1 more
Continuous vector magnetic-field measurements by the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) allow us to study magnetic-field properties of many flares. Here, we review new observational aspects of flare magnetism described using SDO data, including statistical properties of magnetic-reconnection fluxes …
Analysis of the Evolution of a Multi-Ribbon Flare and Failed Filament Eruption
Schmieder, Brigitte; Joshi, Reetika; Chandra, Ramesh +5 more
How filaments form and erupt are topics about which solar researchers have wondered for more than a century and they are still open to debate. We present observations of a filament formation, its failed eruption, and the associated flare (SOL2019-05-09T05:51) that occurred in active region (AR) 12740 using data from the Solar Dynamics Observatory …
Polarization Accuracy Verification of the Chromospheric LAyer SpectroPolarimeter
Hara, Hirohisa; De Pontieu, Bart; Carlsson, Mats +25 more
We have developed an advanced UV spectropolarimeter called Chromospheric LAyer SpectroPolarimeter (CLASP2), aimed at achieving very high accuracy measurements (<0.1% at 3 σ ) of the linear (Q /I and U /I ) and circular (V /I ) polarizations of the Mg II h and k lines (280 nm). CLASP2 was launched on board a NASA sounding rocket on April 11, 201…
On the Evolution of a Sub-C Class Flare: A Showcase for the Capabilities of the Revamped Catania Solar Telescope
Spadaro, Daniele; Guglielmino, Salvo L.; Romano, Paolo +9 more
Solar flares are occasionally responsible for severe space-weather events, which can affect space-borne and ground-based infrastructures, endangering anthropic technological activities and even human health and safety. Thus, an essential activity in the framework of space-weather monitoring is devoted to the observation of the activity level on th…
Dynamics of Explosive Events Observed by the Interface Region Imaging Spectrograph
Tavabi, E.; Zeighami, S.; Heydari, M.
In this research, we investigate Explosive Events (EEs) in the off-limb solar atmosphere, with simultaneous observations from the Si IV, Mg II k, and slit-jaw images (SJI) of the Interface Region Imaging Spectrograph (IRIS), on 17 August 2014, and 19 February. IRIS data can be investigated to observe the motion of matter, fluctuations, energy abso…
Formation and Immediate Deformation of a Small Filament Through Intermittent Magnetic Interactions
Zhang, Liang; Chen, Yao; Zheng, Ruisheng +4 more
It is generally believed that filament formation involves a process of the accumulation of magnetic energy. However, in this article, we discuss the idea that filaments will not erupt and will only deform when the stored magnetic energy is released gradually. Combining high-quality observations from SolarDynamicsObservatory and other instruments, …