Počet záznamů: 1

A new type of small-scale downflow patches in sunspot penumbrae

  1. 1.
    0350115 - ASU-R 2011 RIV FR eng J - Článek v odborném periodiku
    Katsukawa, Y. - Jurčák, Jan
    A new type of small-scale downflow patches in sunspot penumbrae.
    Astronomy & Astrophysics. Roč. 524, December (2010), A20/1-A20/9 ISSN 0004-6361
    Grant CEP: GA AV ČR IAA300030808
    Výzkumný záměr: CEZ:AV0Z10030501
    Klíčová slova: Sun * photosphere * surface magnetism * sunspots * chromosphere
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 4.410, rok: 2010

    Using the Hinode spectro-polarimetric observations of Fe I 630 nm lines and their inversions, we found photospheric downflows in the sunspot penumbra that have the same magnetic polarity as the sunspot umbra. The Stokes profiles seen in the patches are characterized as humps or enhancements on the red wing of the Stokes V profiles. Probably owing to the small size, such downflow patches have not been previously reported in penumbrae. These downflows are not related to the Evershed flow. They are mostly found inside the bright penumbral filaments and in the disk-center side penumbra in our data. We also found that some of the downflow patches are temporally and spatially coincident with chromospheric brightenings in the Ca II H images.
    Trvalý link: http://hdl.handle.net/11104/0190199