Main Objective: We would like to compare the spectroscopic features
in multiple chromospheric lines for active phenomena on the solar surface,
such as sunspots (active regions), plages, flare ribbons, postflare loops,
eruptions, and so on, by spectroscopic observations at multiple
chromospheric lines with BBSO/GST. [See: HOP0488, HOP0511]
AR14178
2025-08-13 02:03 - 09:06 UT
Scientific Justification: Solar active phenomena can be observed in spatially
resolved images, but stellar ones cannot. A so-called "Sun-as-a-star analysis"
has recently been conducted on solar active phenomena by mimicking stellar
observations. To better understand the mechanisms of active phenomena
occurring on stellar surfaces, we would like to compare the spectroscopic
features in multiple chromospheric lines for active phenomena, such as
sunspots (active regions), plages, flare ribbons, postflare loops, eruptions,
and so on, by spectroscopic observations at multiple chromospheric lines
with BBSO/GST. Furthermore, we would like to derive the reactions in the
transition region and in the corona mainly by spectroscopic observations
with Hinode/EIS.