Hinode Instruments - EUV Imaging Spectrometer (EIS)

EIS has sensitivity ten times as high as the ESA SOHO instrument. It utilizes an off-axis parabolic primary and a toroidal diffraction grating in a normal incidence optical layout with high-reflectance Mo/Si multi-layer coatings. The multi-layer coatings have high reflectance in two wavelength ranges, 170-210 A and 250-290 A, and these wavelength ranges are simultaneously observed with two large back-illuminated CCDs. Many EUV emission lines from the transition region, the corona, and flares are contained in these wavelength ranges and observers can select the number of spectral windows up to 25 in the imaging area of two CCDs. A slit/slot exchanger at the prime focus of the primary mirror contains two narrow slits (1arcsec & 2arcsec width) and two wide slots (40arcsec & 266arcsec width). EIS will provide monochromatic images of the transition region and corona at high cadence using a slot. High spectral resolution images can be obtained by rastering with a slit.

EIS will be able to response to XRT's trigger. In addition it will have internal triggers - a flare trigger and a brightpoint trigger. It will also be able to have automatic exposure control for the slots.

• Wavelength range: 170-210A and 250-290 A (the reflectivity of the multilayers restrict the performance below 180A and above 204A)
• Angular resolution: 2arcsec. Four slit/slot positions are available - 1arcsec slit, 2arcsec slit, 40arcsec slot and 266arcsec.
• Spectral/Velocity resolution: 3km/s for Doppler velocities, 20km/s for line widths
• Temporal resolution:
  • In spectrosocopy mode: < 1s in dynamic events ~ 10s in active regions
  • In imaging mode: monochromatic imaging of an active region (~4x4 arcmin) in 3s for dynamic events, 10s otherwise.
  • FOV: 360arcsecx512arcsec

For more details on EIS, check the following links:

• Hinode EIS instrument page at NAOJ
• HINODE Instruments page at MSSL
• EIS Instrumentation page at MSSL JSP Wiki
• EIS Instrumentation page at MSSL Wiki

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References

Mission Wide

• The Hinode (Solar-B) Mission: An Overview
  Kosugi, T., Matsuzaki, K., Sakao, T., Shimizu, T., Sone, Y., Tachikawa, S., Hashimoto, T., Minesugi, K., Ohnishi, A., Yamada, T., Tsuneta, S., Hara, H., Ichimoto, K., Suematsu, Y., Shimojo, M., Watanabe, T., Davis, J.M., Hill, L.D., Owens, J.K., Title, A.M., Culhane, J.L., Harra, L., Doschek, G.A., and Golub, L.
  2007, Solar Physics, 243, pp. 3-17

EIS

• The EUV Imaging Spectrometer for Hinode
  Culhane, J.L., Harra, L.K, James, A.M., Al-Janabi, K., Bradley, L.J., Chaudry, R.A., Rees, K., Tandy, J.A., Thomas, P., Whillock, M.C.R., Doschek, G.A., Korendyke, C.M., Brown, C.M., Myers, S., Mariska, J., Seely, J., Lang, J., Kent, B.J., Shaughnessy, B.M., Young, P.R., Simnett, G.M., Castelli, S., Mahmoud, S., Mapson-Menard, H., Probyn, B.J., Thomas, R.J., Davila, J., Dere, K., Windt, D., Shea, J., Hagood, R., Moye, R., Hara, H., Watanabe, T., Matsuzaki, K., Kosugi, T., Hansteen, V., and Wikstol, O.
  2007, Solar Physics, 243, pp. 19-61

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