Related Experiment Video
Updated: Jun 6, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Magneto-optic Doppler analyzer: a new instrument to measure mesopause winds
Abstract:
The magneto-optic Doppler analyzer (MODA) is a new type of passive optical instrument that one can use to measure the Doppler shift of the sodium nightglow emitted at approximately 91 km near the mesopause. From this measurement, horizontal wind signatures are inferred. The MODA is based on a sodium vapor magneto-optic filter that provides inherent wavelength stability at a low cost. The instrument has been used to take nightly zonal and meridional wind measurements since October 1994 at Niwot Ridge, Colorado (40 °N, 105 °W). We obtained an internally consistent wind signal and measured the semidiurnal tide for several seasons.
Related Concept Videos
Magnetostatic Boundary Conditions
Magnetic Declination
Atomic Emission Spectroscopy: Instrumentation
Doppler Effect - II
Atomic Absorption Spectroscopy: Instrumentation
The atomizer used in AAS can be either a flame atomizer or an...
Doppler Effect - I
