Multiwavelength Sun-as-a-star Analysis of the M8.7 Flare on 2022 October 2 Using Hα and EUV Spectra Taken by SMART/SDDI and SDO/EVE
The Astrophysical Journal(2024)
摘要
This paper presents a multiwavelength Sun-as-a-star analysis of the M8.7
flare on 2022 October 2, which were associated with a filament eruption and the
following coronal mass ejection. The Sun-as-a-star analysis was performed using
Hα data taken by Solar Dynamics Doppler Imager on board the Solar
Magnetic Activity Research Telescope at Hida Observatory, Kyoto University and
full-disk integrated extreme ultraviolet (EUV) spectra taken by the Extreme
ultraviolet Variability Experiment (EVE) on board the Solar Dynamics
Observatory. The Sun-as-a-star Hα spectra showed blueshifted absorption
corresponding to the filament eruption. Furthermore, the EVE O v 629.7
Å spectra showed blueshifted brightening, which can also be attributed to
the filament eruption. Even when the blueshifted absorption became almost
invisible in the Sun-as-a-star Hα spectra, the O v blueshifted
brightening up to -400 km s^-1 was still clearly visible. This result
indicates that even when the shifted components–which are expected to
originate from stellar eruptions–become almost invisible in the spatially
integrated stellar Hα spectra, the erupting materials may still be
present and observable in EUV spectra. Additionally, the Sun-as-a-star
Hα and O v spectra exhibited redshifted absorption and
brightening, respectively, during the decay phase of the flare. These
components probably originate from the post-flare loops, providing clues for
the multi-temperature nature of the post-flare loops in the spatially
integrated observation. Our Sun-as-a-star results suggest that the combination
of Hα and EUV lines allows the investigation of the multi-temperature
structure and temporal development of stellar active phenomena even in
spatially integrated spectra.
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关键词
Solar flares,Stellar flares,Solar filament eruptions,Solar prominences,Solar coronal mass ejections,Solar chromosphere
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