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Image Stabilization System for Hinode (Solar-B) Solar Optical Telescope |
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| Authors: | T Shimizu S Nagata S Tsuneta T Tarbell C Edwards R Shine C Hoffmann E Thomas S Sour R Rehse O Ito Y Kashiwagi M Tabata K Kodeki M Nagase K Matsuzaki K Kobayashi K Ichimoto Y Suematsu |
| Institution: | 1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan 2. Hida and Kwasan Observatories, Kyoto University, Kamitakara, Gifu, 506-1314, Japan 3. National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588, Japan 4. Lockheed-Martin Solar and Astrophysics Laboratory, Palo Alto, CA, 94304, USA 5. Mitsubishi Electric Corp., Amagasaki, Hyogo, 661-8661, Japan 6. Systems Engineering Consultants Corp., Shibuya, Tokyo, 150-0031, Japan |
| Abstract: | The Hinode Solar Optical Telescope (SOT) is the first space-borne visible-light telescope that enables us to observe magnetic-field dynamics in the solar lower atmosphere with 0.2 – 0.3 arcsec spatial resolution under extremely stable (seeing-free) conditions. To achieve precise measurements of the polarization with diffraction-limited images, stable pointing of the telescope (<0.09 arcsec, 3σ) is required for solar images exposed on the focal plane CCD detectors. SOT has an image stabilization system that uses image displacements calculated from correlation tracking of solar granules to control a piezo-driven tip-tilt mirror. The system minimizes the motions of images for frequencies lower than 14 Hz while the satellite and telescope structural design damps microvibration in higher frequency ranges. It has been confirmed from the data taken on orbit that the remaining jitter is less than 0.03 arcsec (3σ) on the Sun. This excellent performance makes a major contribution to successful precise polarimetric measurements with 0.2 – 0.3 arcsec resolution. K. Kobayashi now at NASA/Marshall Space Flight Center, Huntsville, AL 35812, USA. |
| Keywords: | Space vehicles Telescopes Instrumentation: adaptive optics Correlation tracker Image stabilizer Tip-tilt mirror Sun: photosphere Magnetic fields Chromosphere |
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