W. H. Chen

TL;DR: In this article, an ensemble Kalman filter software developed by the National Center for Atmospheric Research (NCAR), called Data Assimilation Research Testbed, is applied to assimilate ground-based GPS total electron content (TEC) observations into a theoretical numerical model of the thermosphere and ionosphere.

TL;DR: In this paper, total electron content (TEC) assimilation into a coupled thermosphere-ionosphere model by using the ensemble Kalman filter results in improved specification and forecast of eastward pre-reversal enhancement (PRE) electric field (E-field).

TL;DR: In this article, the authors conducted a study with the ionospheric assimilation model by assimilating the total electron content observations into the thermosphere-ionosphere coupling model with different high-latitude ionosphere convection models, Heelis and Weimer, and further forecast the variations of ionosphere electron density during the 2015 St. Patrick's Day geomagnetic storm.

TL;DR: In this article, the ionospheric response to the storm over Taiwan that resulted in the apparent inhibition of EPB was investigated by using the data assimilation output, which indicated that on the night of the magnetic storm, pre-reversal enhancement of zonal electric field over Taiwan was weaker when compared to that over India.

TL;DR: In this paper, the ionospheric electron densities obtained from radio occultation soundings of FORMOSAT-3/COSMIC are decomposed into their various constituent tidal components for studying the stratospheric sudden warming (SSW) effects on the ionosphere during 2008-2010.