Magnetic and Doppler Observations of the Photosphere and Low Chromosphere with the Solar Optical Telescope on Hinode

Details Magnetic and Doppler Observations of the Photosphere and Low Chromosphere with the Solar Optical Telescope on Hinode Magnetic and Doppler Observations of the Photosphere and Low Chromosphere with the Solar Optical Telescope on Hinode

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53a1064t&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH53A-1064

Physics

7507 Chromosphere, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7529 Photosphere

Scientific paper

We present magnetic field and Doppler shift measurements in the Mg I b line at 517.3 nm obtained with the Solar Optical Telescope's Narrowband Filter Imager on Hinode. The line core forms in the low chromosphere, and the wings where the measurements are made probably form around the temperature minimum. Stokes IQUV images in the red and blue wings are combined to make movies of longitudinal magnetograms and Dopplergrams. The direction of the transverse field component is also measurable in strong field concentrations. These are compared with very accurate photospheric magnetic measurements in Fe I 630.2 nm from the Spectro-Polarimeter. This comparison calibrates the filter longitudinal magnetograms in flux density and shows changes in field geometry with height. The Doppler measurements are calibrated using wavelength scans through the Mg line profile. A number of emerging and canceling magnetic features were observed in AR 10961 during its disk passage in late June and early July. Since these were made during the Hinode eclipse season, the observations have somewhat lower spatial resolution than usual (0.32 arcsecond pixels), but the uniformity and sensitivity are excellent. Intermittent upflows seen between canceling magnetic features are interpreted in terms of reconnection outflows. Strong, persistent downflows are seen adjacent to but not on flux concentrations outside of sunspots and pores. In the sunspot, running penumbral waves are clearly visible, and steady downflows are observed over the light bridges. Hinode is a Japanese mission developed and launched by ISAS/ JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in cooperation with ESA and NSC (Norway).

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