Hinode observations of flares and active region emergence

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Shimizu, Toshifumi^1

Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Kanagawa 252-5210, Sagamihara, Japan^1

关键词: Active regions;    Field of views;    Flux emergence;    Full-Sun images;    Magnetic distributions;    Significant gas;    Stokes polarimetry;    X-class flares;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012002/pdf
DOI  :  10.1088/1742-6596/440/1/012002

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

After observing the quiet Sun during a long and deep minimum, Hinode's observing priority is now the active Sun, i.e., flares and active regions. Because of its small field-of-view instruments and telemetry restrictions, capturing major flares with good observing coverage needs challenging efforts on operation plannings for Hinode and we have been using the latest available AIA and HMI full-Sun images for targeting. Also, capturing the initial phase of large-scale emerging flux activities is not easy for Hinode without having the forecast of flux emergence before they are visible on the surface. Nevertheless, Hinode has some good examples of observations of such events. In this paper, we briefly discuss two specific observations; X-class flares in March 2012 and a large-scale flux emergence in December 2009. The Stokes polarimetry data for the flares presented in this paper reveals significant gas flows along the neutral line of the sheared magnetic distributions and the change of magnetic field inclination at the areas where penumbral development and disappearance was observed with the occurrence of the flares. The flux emergence and the sunspot formation presented were well monitored by the Hinode three telescopes from the beginning through the end of the emergence, Of particular interest is the finding of a precursory signature in the chromosphere preceding the appearance of sunspot penumbra.