caa a22 4500 445346264 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11207-011-9765-y doi (NATIONALLICENCE)springer-10.1007/s11207-011-9765-y Iodine-Cell Spectroscopy Applied to Investigating the Solar Differential Rotation [Elektronische Daten] [Y. Takeda, S. Ueno] In an attempt to examine whether the spectroscopic Doppler method with an iodine cell (which is known to be successful for precise radial-velocity determinations in stellar astronomy) could be effective for investigating the solar differential rotation, we carried out intensive observations to collect spectra at a large number of points on the solar disk by using the Domeless Solar Telescope along with the horizontal spectrograph of the Hida Observatory. Having converted the resulting line-of-sight velocity component into the angular rotational rate (ω), we derived a differential rotation law, $\omega_{\mathrm{sidereal}}\; (\mathrm{deg}\,\mathrm{day}^{-1}) =14.03 (\pm0.06)-1.84 (\pm0.57) \sin^{2}\psi-1.92 (\pm0.85) \sin^{4}\psi$ (ψ: heliographic latitude), which is reasonably consistent with other spectroscopic determinations published so far. Our analysis also revealed several practical points to note for successful application (e.g., exclusion of those data that are not well distant from the meridian; mutual data subtraction/averaging for symmetric counterparts at the eastern and western hemisphere). Considering its easiness and cheapness, this iodine-cell-featured spectroscopic method may be regarded as an effective and practical tool for studying the differential rotation of the Sun. Springer Science+Business Media B.V., 2011 Center-limb observations nationallicence Rotation nationallicence Spectrum, visible nationallicence Velocityfields,photosphere nationallicence Takeda Y. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, 181-8588, Tokyo, Japan aut Ueno S. Kwasan and Hida Observatories, Kyoto University, Kurabashira, Kamitakara, 506-1314, Takayama, Gifu, Japan aut Solar Physics Springer Netherlands 270/2(2011-06-01), 447-461 0038-0938 270:2<447 2011 270 11207 https://doi.org/10.1007/s11207-011-9765-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9765-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Takeda Y. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, 181-8588, Tokyo, Japan aut NATIONALLICENCE 700 1- Ueno S. Kwasan and Hida Observatories, Kyoto University, Kurabashira, Kamitakara, 506-1314, Takayama, Gifu, Japan aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/2(2011-06-01), 447-461 0038-0938 270:2<447 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer