Solar Flare Observations with Integral Field Spectroscopy in H-alpha Spectra and SDO/AIA
Abstract
Integral field spectroscopy is a two dimensional spectroscopic technique, providing spectra simultaneously for each spatial direction of an extended two-dimensional field. Using the field integral spectroscopy made of microlenslet-array (30x30 lenslets) in H-alpha spectrum, GOES C- and M-class flares on 3 Nov 2011 were successfully observed with the 60 cm aperture Domeless Solar Telescope at Hida Observatory, Kyoto University. The data spatially sampled with 0.5 arcsec over 10x10 arcsec FOV and 1 nm wavelength band centered H-alpha line demonstrated that simultaneous 2D spectroscopic observations over extended solar structures, at a high spatial resolution and temporal cadence, are important to track and understand the physics of transient phenomena happening in impulsive flare bright kernels. We made monochromatic images at given wavelengths in the H-alpha line and nearby continuum to co-align the data with X-ray, UV images and magnetograms from SDO/AIA and HMI. To reveal dynamical properties of the flare kernels, we carried out line profile analysis and derived 2-D distribution of parameters such as line-of-sight velocity and line width. The results clearly show the rapid development of red asymmetry at the flare kernels, giving a large downward Doppler shifts of up to 50 km/sec. The accompanied formation of coronal dynamic flaring loop structures seen in SDO X-ray images are consistent with a scenario of downward motion of compressed chromospheric flare kernels due do impulsive heat flow from the corona to the chromosphere and simultaneous evaporation of the chromospheric material into the corona.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E3284S