Department of Physics & Astronomy
University of New Mexico

Center for Astrophysics Research and Technologies Seminar Series

Modeling the Low-Frequency Sky with the Long Wavelength Array

Presented by Craig Taylor (UNM)

Time-domain astronomy at megahertz frequencies has become a growing focus for low frequency
telescopes as technology and methods of processing data have improved during the last few decades. In this effort, creating quiet sky models for local and cosmic observations of the sky is crucial in increasing sensitivity to transient phenomena both in Earth's atmosphere and beyond. Previous Long Wavelength Array (LWA) transient studies utilized image subtraction of a subset of recent captures to create background-subtracted images. While this method is quick to compute clean images on the fly, it can also introduce noise from corrupted earlier images and create non-physical structures in subtracted data. This presentation will be an overview of over a year of efforts to build a Local Sidereal Time (LST) mapped, all-sky model, of the low-frequency sky (20-40MHz) as seen by two LWA stations. In addition to an exploration of the many applications for model subtracted sets of images. Particularly with emphasis on a NASA-funded effort to study and track dynamic ionosphere structures called Sporadic E-regions.

2:00 pm, Thursday, July 14, 2022

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