Using Bi-Static HF observations of traveling ionospheric disturbances (TID) to constrain first principle models of atmospheric gravity waves (AGWs)
Abstract
Atmospheric buoyancy waves (often called gravity waves) and acoustic waves are an omnipresent feature in the upper atmosphere and they interact with the ionosphere to form traveling ionospheric disturbances (TIDs). They are believed to be generated by a whole host of geophysical phenomena, from uplift generated by winds blowing over topographic features to tropospheric weather systems to sudden stratospheric warming (SSW) events to Joule heatingin the auroras. In the context of the proposed investigation, we are interested in the observational characteristics of gravity waves and implications for modeling their impacts on Navy and National Intelligence Community systems. TIDs impart a Doppler shift on skywavepropagated high-frequency (HF) radio signals and they have a profound impact on the observed angle of arrival (AoA) and group delay of HF signals. Incorrectly accounted for, these impacts can severely degrade operational naval and intelligence systems operating in the HF band. The essence of the proposed work is to quantify and understand the variability of the ionosphere produced by these disturbances. We will evaluate and extend models of their impact over a region of interest by collecting and analyzing signals of opportunity and assimilating the observations into physics-based models of TIDs.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2017
- Source ID
- N000141712123
Entities
People
- E. S. Miller
Organizations
- Johns Hopkins University
- Office of Naval Research
- United States Navy