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40 papers · 1 filter
Quasi-periodic Fast-mode Magnetosonic Wave Trains Within Coronal Waveguides Associated with Flares and CMEs
Wei Liu, Leon Ofman, Brittany Broder +2
Quasi-periodic, fast-mode, propagating wave trains (QFPs) are a new observational phenomenon recently discovered in the solar corona by the Solar Dynamics Observatory with extreme…
On the Active Region Bright Grains Observed in the Transition Region Imaging Channels of IRIS
H. Skogsrud, L. Rouppe van der Voort, B. De Pontieu
The Interface Region Imaging Spectrograph (IRIS) provides spectroscopy and narrow band slit-jaw (SJI) imaging of the solar chromosphere and transition region at unprecedented spati…
Comparison of 30 THz impulsive burst time development to microwaves, H-alpha, EUV, and GOES soft X-rays
R. Miteva, P. Kaufmann, D. P. Cabezas +11
The recent discovery of impulsive solar burst emission in the 30 THz band is raising new interpretation challenges. One event associated with a GOES M2 class flare has been observe…
Time Dependent Non-Equilibrium Ionization of Transition Region Lines Observed with IRIS
Juan Martinez-Sykora, Bart De Pontieu, Viggo H. Hansteen +1
The properties of non-statistical equilibrium ionization of silicon and oxygen ions are analyzed in this work. We focus on four solar targets (quiet sun, coronal hole, plage, quies…
Numerical Study on Emergence of Kinked Flux Tube for Understanding of Possible Origin of Delta-spot Regions
Shinsuke Takasao, Yuhong Fan, Mark. C. M. Cheung +1
We carried out a magnetohydrodynamics simulation where a subsurface twisted kink-unstable flux tube emerges from the solar interior to the corona. Unlike the previous expectations…
The formation of IRIS diagnostics VIII. IRIS observations in the C II 133.5 nm multiplet
Bhavna Rathore, Tiago M. D. Pereira, Mats Carlsson +1
The C II 133.5 nm multiplet has been observed by NASA's Interface Region Imaging Spectrograph (IRIS) in unprecedented spatial resolution. The aims of this work are to characterize…