The EUV Imaging Spectrometer for Hinode

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Solar Physics

DOI:https://doi.org/10.1007/s01007-007-0293-1· OSTI ID:960141

Culhane, J; Harra, L; James, A; Al-Janabi, K; Bradley, L; Chaudry, R; Rees, K; Tandy, J; Thomas, P

The EUV Imaging Spectrometer (EIS) on Hinode will observe solar corona and upper transition region emission lines in the wavelength ranges 170?-?210 Angstroms and 250?-?290 Angstroms . The line centroid positions and profile widths will allow plasma velocities and turbulent or non-thermal line broadenings to be measured. We will derive local plasma temperatures and densities from the line intensities. The spectra will allow accurate determination of differential emission measure and element abundances within a variety of corona and transition region structures. These powerful spectroscopic diagnostics will allow identification and characterization of magnetic reconnection and wave propagation processes in the upper solar atmosphere. We will also directly study the detailed evolution and heating of coronal loops. The EIS instrument incorporates a unique two element, normal incidence design. The optics are coated with optimized multilayer coatings. We have selected highly efficient, backside-illuminated, thinned CCDs. These design features result in an instrument that has significantly greater effective area than previous orbiting EUV spectrographs with typical active region 2?-?5 s exposure times in the brightest lines. EIS can scan a field of 6x8.5 arc?min with spatial and velocity scales of 1 arc?sec and 25 km?s-1 per pixel. The instrument design, its absolute calibration, and performance are described in detail in this paper. EIS will be used along with the Solar Optical Telescope (SOT) and the X-ray Telescope (XRT) for a wide range of studies of the solar atmosphere.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 960141
• Report Number(s): BNL--83127-2009-JA
• Journal Information: Solar Physics, Journal Name: Solar Physics Vol. 243; ISSN 0038-0938; ISSN SLPHAX
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CALIBRATION
COATINGS
DESIGN
ELECTRON TEMPERATURE
ELEMENT ABUNDANCE
HEATING
ION TEMPERATURE
LINE BROADENING
MAGNETIC RECONNECTION
OPTICS
PERFORMANCE
PLASMA
SOLAR ATMOSPHERE
SOLAR CORONA
SPECTRA
SPECTROMETERS
TELESCOPES
VELOCITY
WAVE PROPAGATION
WAVELENGTHS
national synchrotron light source