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Helioseismology by Hinode(Solar-B)

Hinode, a Japan-US-UK collaboration, is a mission equipped with the Solar Optical Telescope (SOT), X-ray Telescope (XRT), and EUV Imaging Spectrometer (EIS). Its main goal is to understand the generation, transport, and dissipation of the solar magnetic field. The high-resolution SOT Dopplergrams obtained can be used for local helioseismology.

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Helioseismology by Hinode(Solar-B)

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  1. Helioseismology by Hinode(Solar-B) Takashi Sekii (NAOJ)

  2. Hinode/Solar-B (1/2) • It is an ISAS mission but in fact there are more people at NAOJ working on it (Solar-B project office is headed by S. Tsuneta) • Japan-US-UK collaboration • Successfully launched on 23 September 2006 and named Hinode • Pronounced (approximately) He-nod-A • Means ‘Sunrise’ HELAS Workshop September 2006

  3. Hinode/Solar-B (2/2) • Equipped with Solar Optical Telescope(SOT), X-ray Telescope (XRT) and EUV Imaging Spectrometer (EIS) • On a Sun-synchronous orbit (alt.~600km) , providing 24-hr coverage for 8 months each year • The main scientific goal: to understand generation, transport and dissipation of solar mangetic field • 50-cm SOT produces high-resolution Dopplergrams that can be used for local helioseismology HELAS Workshop September 2006

  4. Solar Optical Telescope (1/2) • Narrowband Filter Imager(NFI) produces filtergrams, which are then converted to dopplergrams • Spatial resolution: 0.2”-0.3” = 150km (@disc centre) • pixel size 0.08” • Field of view: 328”×164” (unvignetted 264”×164”) [164” ～ 10 (heliographic) degree] • Equipped with correlation tracker • Cadence can be down to ~15sec HELAS Workshop September 2006

  5. Solar Optical Telescope (2/2) • Dopplergram target lines • Photospheric: Fe I 5576 (non-magnetic) • Chromospheric: Mg I 5173 (lower chromosphere, also for magnetogram) • Can use photospheric magnetic lines for comparison with MDI/HMI • Can observe high latitudes • ‘Simultaneous’ magnetograms can be acquired too HELAS Workshop September 2006

  6. Concluding messages • Thanks for your kind invitation, sorry I could not come • SOT on-board Hinode provides opportunity for a high-resolution (although narrow FOV) local helioseismology • Hope you all will be joining us in analysing Hinode data HELAS Workshop September 2006

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