Climatology of planetary waves seen in ionospheric F-region perturbations using TEC of GPS
(DFG JA 836/19-1, 2005-2007, JA 836/24-1, 2008-2009)
Staff: P. Hoffmann PI: Prof. Christoph Jacobi
Ionosondes, as most ground-based system, however, cannot provide a full global picture of PW due to the limited regional coverage following from their geographical distribution. One possible mean to overcome this disadvantage is using ionospheric information from ground-based GPS receivers, available on a routine basis through the International GPS Service. However, from ground-based GPS measurements only the vertically integrated electron density (TEC) can be derived. Therefore, the interpretation of waves seen in TEC requires a particular careful analysis of the observations. Additional measurements allowing the estimation of the profile shape including the height of the electron density maximum shall be used to evaluate or to complete the TEC findings.
Long-period planetary waves (PW) cannot propagate directly into the upper thermosphere. Nevertheless, they already have been identified there from ionosonde measurements and partly they can directly be correlated to neutral atmosphere PW.
The propagation of PW into the thermosphere is analyed using the circulation model COMMA and correlation of ionospheric waves with neutral atmospheric PW mainly anaylsed using ground-based radars such as the Collm SKiYMET meteor radar
Publications related to the project
An overview over the project (poster at EGU 2008 General Assembly)
Upper panel: Differential TEC (black) and TID proxy modulation at PW time scales. Lower panel: Seasonal cycle of GW (potential energy from SABER temperature profiles) modulation at PW time scales.
The project is part of the DFG priority program "CAWSES". The project bases on a collaboration with
- DLR-Institute of Communications and Navigation, Neustrelitz
- Russian State Hydrometeorological University, St. Petersburg