Center-to-Limb Variation of Stokes V Asymmetries in Solar Pores Observed with the Hinode Spectro-Polarimeter
Tsuneta, Saku; Shimizu, Toshifumi; Kubo, Masahito; Ichimoto, Kiyoshi; Katsukawa, Yukio; Nagata, Shin'ichi; Shine, Richard A.; Suematsu, Yoshinori; Tarbell, Theodore D.; Title, Alan M.; Sakurai, Takashi; Lites, Bruce; Morinaga, Shuji
Japan, United States
Abstract
Here we present spectro-polarimetric measurements of several pores and the surrounding regions taken with the Solar Optical Telescope aboard Hinode at various viewing angles. We analyzed the Stokes V area asymmetry, and confirmed that it is depressed at the center of the pores, while it shows large positive values (a blue lobe larger than a red lobe) in the surrounding area; this is consistent with a previous report. In addition to this ring of positive asymmetry, we found regions of alternating positive and negative area asymmetries when weak V regions were observed near the solar limb. The positive asymmetry occurs on the disk-center side and the negative asymmetry on the limb side of the magnetic concentrations. These center-to-limb variations of the Stokes V area asymmetry can be interpreted as being a systematic inflow of plasma into the magnetic concentrations from their surroundings.