Data assimilation of plasmasphere and upper ionosphere using COSMIC/GPS slant TEC measurements

Plasmasphere and Upper Ionosphere Contributions and Corrections During the Assimilation of GPS Slant TEC

Towards Observing Tsunamis in the Ionosphere Using GPS TEC Measurements

Tsunamis have been a significant threat to humans living in coastal regions throughout recorded history. The recent tsunami of September 29, 2009 was a tragic reminder of this fact, as the waves caused over 180 deaths on the islands of Samoa, American Samoa, and Apia in the south Pacific. Recent modeling results and observations have demonstrated that the ionospheric signature of an ocean tsuna...

Data Assimilation Using the Global Ionosphere-Thermosphere Model

We consider a data assimilation technique for coupled ionospheric and thermospheric dynamics. The Global Ionosphere-Thermosphere Model (GITM) is used to simulate the ionospheric and thermospheric dynamics, and evaluate the performance of the data assimilation scheme that estimates the ion densities and flow speeds. This estimation technique is based on the state dependent Riccati equation (SDRE...

Sounding of the topside ionosphere/plasmasphere based on GPS measurements from CHAMP: Initial results

[1] Beside the GPS radio occultation measurements of the troposphere and ionosphere, the CHAMP satellite tracks presently up to 8 GPS satellites simultaneously for navigation. The received dual frequency GPS signals provide valuable information on the ionization state of the topside ionosphere and plasmasphere. This paper briefly describes a new developed model assisted technique to improve the...

Absolute Ionosphere Slant Delays From Ambiguous Carrier Phase Data

A new method for computing absolute (unambiguous) levels of Total Electron Content (TEC) in the ionosphere and subsequently the L1 and L2 phase advances of GPS is presented, dubbed “ICON” (for its primary purpose of modeling the Ionosphere over CONus). Unlike previous computational methods, this method relies solely upon dual-frequency, ambiguous carrier phase data with no reliance on pseudo-ra...