Are subsurface flows and coronal holes related?

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Komm, R.^1 ; Howe, R.^2 ; Hernández, I. González^1 ; Harra, L.^3 ; Baker, D.^3 ; Driel-Gesztelyi, L. Van^3

National Solar Observatory, Tucson, AZ 85719, United States^1

School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom^2

Mullard Space Science Laboratory, University College London, Dorking RH5 6NT, United Kingdom^3

关键词: Active regions;    Carrington rotations;    Cyclonic vorticity;    High resolution;    Horizontal subsurface flow;    Solar subsurface flows;    Subsurface Flow;    Vertical flows;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012022/pdf
DOI  :  10.1088/1742-6596/440/1/012022

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We study synoptic maps of solar subsurface flows covering six Carrington rotations (2050 to 2055). The subsurface flows are determined with a ring-diagram analysis of GONG high-resolution Doppler data. We identify the locations of coronal holes in synoptic maps of EUV images at 195A from the EIT instrument and determine the characteristics of associated subsurface flows. We study two long-lived coronal holes that are present during this epoch. We find that large-scale patterns are present in the subsurface flows but appear to be unrelated to these coronal holes. The horizontal subsurface flows associated with the two long-lived coronal holes are weakly divergent (upflows) with small cyclonic vorticity. These flows are thus similar to subsurface flows of quiet regions with regard to the vertical flows and similar to flows of active regions with regard to vorticity.