When
Where
Title
Localization of Sky Polarization Neutral Points: Instrument Prototype Design and Deployment
Abstract
What simple observable can be used to detect changes in atmospheric conditions? This dissertation investigates the use of sky polarization neutral points as a potential answer. Polarization describes the trace of the electric field vector in a transverse electromagnetic wave. The sky becomes partially polarized when sunlight interacts with atmospheric molecules, producing a structured polarization pattern across the sky. Due to topological constraints, within this pattern, there exist locations where the polarization state becomes undefined. These locations, known as neutral points, are governed by atmospheric scattering processes and therefore depend on the Sun's location, observation wavelength, and the type and concentration of atmospheric scatterers. Making the neutral points sensitive indicators of atmospheric change.
The main contribution of this work is the design and deployment of an ultraviolet linear Stokes imaging polarimeter that tracks the Babinet neutral point throughout the day. By determining the location of the Babinet neutral point with arcsecond-level spatial resolution, this system provides a repeatable and comparable method for monitoring atmospheric conditions using a single observable. This approach enables potential applications in detecting aerosols, such as wildfire smoke, and improving our understanding of the atmosphere.
Please email Jini at jini@optics.arizona.edu or Clarissa at cdeleon@arizona.edu for a Zoom link.