Science Seminars

7/27/2017 – Adam Kellerman; Data Assimilation, Modeling, and Forecasting Ring-Current to Radiation-Belt Electrons in the Near-Earth Space Environment

Speaker: Adam Kellerman (UCLA)
Date: Monday, Jul 27, 2020
Time: 4:00 PM
Location: SPSC W120

Seminar Abstract:

An ever-increasing reliance on space-borne assets by our society, has driven the need for understanding the source, and dynamics of ring-current to radiation-belt electrons in the near-Earth space environment. This presentation will detail how measurements from ground- and space-borne instruments have been used together with state-of-the-art models, and supercomputing resources, to study and forecast the dynamics of this fascinating, but potentially hazardous radiation environment. I will illustrate how data and models may be combined through data-assimilation to discover new physical processes, and to re-analyze the past state of a given system. Using this ‘reanalysis’ dataset, it will be shown how solar wind structures, associated with high-speed solar wind, can have a profound, but varied effect on the Earth’s radiation belts. In addition, I will show how we may utilize ground-based measurements of radio waves, emanating from distant stars and galaxies, to remote sense electron loss to the atmosphere at many locations simultaneously. This research has lead to a recently developed data-assimilative radiation-belt forecast model, and illustrates how forecast analysis can be of direct benefit to both fundamental research and forecast applications.