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5015 - AHF - Arrival Heights Fabry-Perot Interf Sp
Instrument Type: Instrument > OpticalInstrument > Interferometer > FabryPerot
Observatory: None
Observation Site: AHF - Arrival Heights Fabry-Perot Interf Sp
Operating Mode:

Instrument Page: AHF

The Fabry-Perot Spectrometer at Arrival Heights, Antarctica (77.8296 S, 166.6627 E, 190.3 m ASL) has been operated since 2002 by the Department of Earth and Space Sciences, University of Washington. The apex magnetic coordinates of Arrival Heights at 250 km height in 2002 were (-80.1, -34.3) with a magnetic declination of 142.6 deg, an inclination of -81.3 deg, and 0 UT at 17.15 MLT. The dispersing element of the spectrometer is an air-spaced, 14 cm diameter effective clear-aperture Fabry-Perot etalon, which is both self-aligning and self-stabilizing. It is operated near the optimum operational point (2.0 cm spacer) for kinetic temperature determinations (Hernandez, 1988). The spectrometer operates simultaneously at two wavelengths, which are arbitrarily selected by the use of dichroic mirrors and narrow (0.3 nm wide) interference filters. The inherent stability of the spectrometer is about 0.5 m/s (632.8 nm) for periods of months, because of its self-stabilizing properties. The instrumental internal stability calibration is updated every 9 s.