2001/07/01 by Ayumi Asai, Takako T. Ishii, Hiroki Kurokawa · 109 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Coronal mass ejection #Ionosphere and magnetosphere dynamics #Magnetic field #Observatory #Physics #Plasma #Solar and Space Plasma Dynamics #Solar wind #Sunspot #astro-ph
paper · pdf · doi:10.1086/321738
published in The Astrophysical Journal 555(1), L65-L68 (IOP Publishing) · 6 pages, 1 table, 4 figures
openalex publication_date 2001/07/01 · arxiv created 2001/11/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present conspicuous activities of plasma ejections along a light bridge of a stable and mature sunspot in NOAA Active Region 8971 on 2000 May 2. We found the ejections both in the Hα (10 4 K) images obtained with the Domeless Solar Telescope at Hida Observatory and in the 171 Å (Fe IX/Fe X; ~10 6 K) images obtained with the Transition Region and Coronal Explorer . Main characteristics of the ejections are as follows: (1) Ejections occur intermittently and recurrently. (2) The velocities and the timings of the 171 Å ejections are the same as those of Hα ejections. (3) The appearance of the ejections are different from one another; i.e., the Hα ejections have a jetlike appearance, while the 171 Å ejections are like loops.