Regional 4-D modeling of the ionospheric electron density |
| |
Authors: | M Schmidt D Bilitza CK Shum C Zeilhofer |
| |
Institution: | 1. Deutsches Geodätisches Forschungsinstitut (DGFI), Alfons-Goppel-Strasse 11, 80539 München, Germany;2. Raytheon ITSS, NASA Goddard Space Flight Center, SPDF, Greenbelt, USA;3. Geodetic Science, School of Earth Sciences, The Ohio State University, 275 Mendenhall, 125 S Oval Mall, Columbus OH 43210, USA |
| |
Abstract: | The knowledge of the electron density is the key point in correcting ionospheric delays of electromagnetic measurements and in studying the ionosphere. During the last decade GNSS, in particular GPS, has become a promising tool for monitoring the total electron content (TEC), i.e., the integral of the electron density along the ray-path between the transmitting satellite and the receiver. Hence, geometry-free GNSS measurements provide informations on the electron density, which is basically a four-dimensional function depending on spatial position and time. In addition, these GNSS measurements can be combined with other available data including nadir, over-ocean TEC observations from dual-frequency radar altimetry (T/P, JASON, ENVISAT), and TECs from GPS-LEO occultation systems (e.g., FORMOSAT-3/COSMIC, CHAMP) with heterogeneous sampling and accuracy. |
| |
Keywords: | Electron density B-splines Multi-resolution representation Empirical orthogonal functions |
本文献已被 ScienceDirect 等数据库收录! |
|