SET has teamed with Leidos, Computational Physics, Inc. (CPI), the University of Florida (UFL), Utah State University (USU), and Vesperix Corp. (VI), to develop an innovative and comprehensive approach to the DARPA AtmoSense program. Our team's program is called Sensing Tropospheric Events Remotely using Electromagnetics Optimally (STEREO) and focuses on advancing the state of the art to detect modifications of the total electron content (TEC) of the ionosphere. The STEREO program is demonstrating Very Low Frequency (VLF) holography of the D-region of the ionosphere to observe ionospheric events at long distances (well over the horizon) with high spatial (< 100km) and temporal (< 10s) resolution. This is being coupled with improvements in atmospheric characterization and propagation modeling to reduce uncertainty in the association between an ionospheric event with a tropospheric or near surface event. SET's role in this work is to provide the climatological uncertainties in neutral atmosphere and ionosphere states, whether they be solar minimum/maximum, geomagnetic storms, seasonal, or altitudinal. This page links to that uncertainty as determined from SET's High Accuracy Satellite Drag Model (HASDM) density database for neutral thermosphere densities as well as from USU's Global Assimilation of Ionosphere Measurements (GAIM) database for ionosphere parameters.

Thermosphere and ionosphere density uncertainties Charts

Thermosphere densities: from the SET HASDM density database



Ionosphere densities: from the USU GAIM database



GUI interface for downloading uncertainties

SET Subcontract Partners

Utah State University provides the historical GAIM ionosphere densities from which uncertainties are derived