A Flare Observed in Coronal, Transition Region and Helium I 10830 Å Emissions

Abstract

On June 17, 2012, we observed the evolution of a C-class flare associated with the eruption of a filament near a large sunspot in the active region NOAA 11504. We obtained high spatial resolution filtergrams using the 1.6 m New Solar Telescope at the Big Bear Solar Observatory in broad-band TiO at 706 nm (bandpass:10 Å) and He I 10830 Å narrow-band (bandpass: 0.5 Å, centered 0.25 Å to the blue). We analyze the spatio-temporal behavior of the He I 10830 Å data, which were obtained over a 90" X 90" field of view with a cadence of 10 sec. We also analyze simultaneous data from the Atmospheric Imaging Assembly and Extreme Ultraviolet Variability Experiment instruments on board the Solar Dynamics Observatory spacecraft, and data from Reuven Ramaty High Energy Solar Spectroscopic Imager and GOES spacecrafts. Non-thermal effects are ignored in this analysis. Several quantitative aspects of the data, as well as models derived using the "0D" Enthalpy-Based Thermal Evolution of Loops model (EBTEL: Klimchuk et al. 2008) code, indicate that the triplet states of the 10830 Å multiplet are populated by photoionization of chromospheric plasma followed by radiative recombination. Surprisingly, the He II 304 Å line is reasonably well matched by standard emission measure calculations, along with the C IV emission which dominates the AIA 1600 Å channel during flares. This work lends support to some of our previous work combining X-ray, EUV and UV data of flares to build models of energy transport from corona to chromosphere.

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• Ultra-narrow Negative Flare Front Observed in Helium-10830~Å using the 1.6 m New Solar Telescope
• He I 10830 Å Dimming During Solar Flares, I. The Crucial Role of Non-Thermal Collisional Ionisations
• Two-Phase Heating in Flaring Loops
• Gradual Solar Coronal Dimming and Evolution of Coronal Mass Ejection in the Early Phase
• Magnetic and dynamical photospheric disturbances observed during an M3.2 solar flare
• Prospects of solar magnetometry - from ground and in space
• The Neupert Effect of Flare UltraViolet and Soft X-ray Emissions
• A partial filament eruption in three steps induced by external magnetic reconnection
• High flow speeds and transition-region like temperatures in the solar chromosphere during flux emergence
• Negative flare in the He I 10830 Å line in facula
• Untangling the Near-IR Spectral Features in the Protoplanetary Environment of KH 15D
• Multi-Passband Observations of A Solar Flare over the He I 10830 Å line
• Comparison of Enhanced Absorption in He I 10830 Å in Observations and Modeling During the Early Phase of a Solar Flare
• Measurement of Vector Magnetic Field in a Flare kernel with a Spectropolarimetric Observation in He I 10830 A