| Presentation Title: | GST High-cadence Observations to Solar Lower Atmosphere Energy Release |
| Author(s): | Xu Yang, Wenda Cao, Vasyl Yurchyshyn, Yi-Min Huang, Meiqi Wang, Jiong Qiu, Kaifan Ji |
Abstract:
High-spatial-resolution imaging is highly valued within the solar physics community. However, ground-based observations face challenges as the telescope diffraction limit approaches the photon mean-free-path. Meanwhile, elucidating the energy release mechanisms in the lower solar atmosphere could benefit from high-temporal-resolution observations. We conducted a series of case studies using GST high-cadence imaging spectroscopy observation to offer a distinctive perspective. In a study of a small-scale X-point reconnection event, our observations resolved a 2 Mm reconnection current sheet with a width of 80–120 km in Hα line center images. Corresponding features, including current sheet counterparts and outflows, were detected in DUV slit-jaw images from IRIS and across all EUV wavelengths of SDO/AIA. Plasmoids were discerned within the fine structures of the heated current sheet in Hα images. In another observation of an X-1 white light flare, GST captured the dispersal motion of two white-light kernels in the visible spectrum for the first time. Analysis of the light curves from these kernels aligned with FERMI HXR time profiles, revealing the flare's rapid evolution. This finding suggests that the energy source of the white light emission in this flare originates from the direct heating of energetic particles.