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1/2m Black Ebert-Fastie Spectrometer
Panel (A): Image of the 1/2m focal length Ebert-Fastie spectrometer at the Optical lab at the University Courses on Svalbard (UNIS), Norway. (1) is shutter, (2) instrument housing, (3) cooler for the photo multiplier tube, (4) tripod,  (5) photo multiplier amplifier and discriminator, (6) light protective cell, (7) high voltage supply, (8) driver to shutter motor, and (9) stepper  motor connected to grating shaft. Panel (B): Three-dimensional optical diagram of the spectrometer.  (1) is entrance slit, (2) concave mirror, (3) grating, (4) exit slit,  (5) collector lens, (6) photo multiplier tube, and (7) broadband order sorting filter.

Scientific objectives
Its aim is to measure the spectral character of the high latitude aurora and airglow for studies of atomic and molecular processes in the upper atmosphere. Support magnetospheric surveys by establishing incoming particle type and energy as a function of time.

Owner: UNIS
Contacts
PI: Fred Sigernes
Address: UNIS, P.O. Box 156, 9171 Longyearbyen, Norway
E-mail: fred.sigernes@unis.no

Co-PI: Dag Lorentzen
Address: UNIS, P.O. Box 156, 9171 Longyearbyen, Norway
E-mail: dag.lorentzen@unis.no

Co-PI: C.S. Deehr
Address: Geophysical Institute, University of Alaska Fairbanks,
903 Koyokuk Drive, PO Box 757320, Fairbanks,
Alaska 99775-7320, USA
E-mail: cdeehr@giuaf.gi.alaska.edu

Instrument specifications
Time resolution: 8 seconds to 5 minutes
Spatial coverage: Geomagnetic meridian
Spatial resolution: 8 x 8 deg fov
Spectral resolution: > 0.1 nm