AOSC Seminar by Dr. Daniel Hodyss, 11/16/2023
AOSC Seminar
Dr. Daniel Hodyss
Naval Research Laboratory
Title:
An Introduction to Ionospheric Data Assimilation
Abstract:
In this talk I will introduce the basic principles constraining data assimilation (DA) and prediction for the ionosphere. First, I will go over what makes ionospheric prediction problems different from that of traditional numerical weather prediction. As an example, the fact that the ionosphere consists of charged particles means that they are modified by electric and magnetic fields, which leads to radically different correlation structures for the common field variables describing ionospheric winds and densities. Geostrophy is nowhere to be found! Next, I will introduce a simple, heuristic model we’ve recently developed that allows for a basic understanding of the governing principles controlling prediction and DA for the ionosphere. This model setup relies on the fact that the ionosphere is a strongly forced system governed by solar forcing from above, chemistry, and atmospheric forcing from below. We verify the efficacy of this heuristic model by comparing what it’s telling us about the ionospheric DA system with the Navy’s operational ionospheric model, which we run with an ensemble Kalman filter.
Bio:
Dan Hodyss grew up in South Florida. He attended Florida Atlantic University in Boca Raton, FL earning a BS in Physics and a BA in Mathematics. He then went on to the University of California - Davis to earn a MS and PhD in Atmospheric Science. His PhD was about examining the origins and structure of atmospheric low-frequency variability from the perspective of solitary wave models. He then went to the Rosenstiel School of Marine, Atmospheric and Earth Science at the University of Miami as a Rosenstiel Postdoctoral Fellow to work on understanding unstable waves in tropical cyclones as well as the targeted observation problem. After this he became a physical scientist at the Naval Research Laboratory where he now works on statistical problems in meteorology, space sciences, and structural acoustics.
Contact: Jon Poterjoy
If you are not subscribed to seminar announcements and need a link to this online seminar please contact aosc-helper. You can also subscribe to weekly links and announcements below.
AOSC Seminar
Pre-seminar refreshment: N/A
Seminar: 3:30-4:30pm, Room: ATL 2400(only when in-person)
Meet-the-Speaker: 4:30-5:00pm, Room: ATL 3400(only when in-person) [For AOSC Students only]
[ Subscribe to receive seminar announcements | Email aosc-deptseminar@umd.edu to give a seminar ]