HAO Colloquium Series Presents Larry Paxton / Johns Hopkins Applied Physics Lab

Understanding the Upper Atmosphere Using Ultraviolet Remote Sensing

Ultraviolet remote sensing provides us, in one relatively small package, the ability to explore the composition of the neutral atmosphere (O, O2, and N2) and the altitude profile of these constituents; auroral imagery that provides the characteristic energy and flux of the precipitating particles; and 3D imagery of the structure and dynamics of the ionosphere.

In this talk we review the basic physics of ultraviolet remote sensing, how a simple UV sensor works (and why one has to be very careful in the design) and what we learn by flying these sensors. We discuss this in terms of the challenges of understanding space weather and the geospace environment. In particular, we will discuss how other sensors can be combined with UV sensors to provide insight into the structure and dynamics of the ionosphere.  We use two tools for this Observing System Simulation Experiments (OSSE) and data assimilation models. 

Some results from our SSUSI and GUVI experiments will be shown and discussed. The data are available at http://ssusi.jhuapl.edu and http://guvi.jhuapl.edu. I will provide an overview of these data sources; the combination of these data with other data and models; and emerging opportunities for collaboration.


Date and time: 
Wednesday, April 29, 2015 - 1:30pm to 2:30pm
South Auditorium