EUV Imaging Spectrometer (EIS)

The telescope is an off-axis paraboloid design, with focal length 1.9m and mirror diameter 150mm.

EIS has a total length of 3m. Multilayer toroidal gratings disperse the spectrum onto 2 detectors

covering 40A each.

* Wavelength range: 170-210A and 250-290 A (the reflectivity of the multilayers restrict the performance below 180A and above 204A)

* Angular resolution: 2".

Four slit/slot positions are available - 1" slit, 2" slit, 40" slot and 266".

* 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 arc min) in 3s for dynamic events, 10s otherwise.

* FOV: 360"x512"