Magnetic Storms Effects on the Ionosphere TEC through GPS Data

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...

Nonlinear Estimation to Assimilate GPS TEC Data into a Regional Ionosphere Model

A new method of is being developed to estimate the ionosphere’s 3-dimensional electron density distribution based on GPS slant TEC data. The goal of this effort is to develop a generalized parametric ionospheric model that is amenable to data assimilation using powerful nonlinear least-squares batch filtering techniques and related techniques. In addition to assimilating GPS TEC data, this meth...

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

November 2003 event: effects on the Earth’s ionosphere observed from ground-based ionosonde and GPS data

Intense late-cycle solar activity during October and November 2003 produced two strong geomagnetic storms: 28 October–5 November 2003 (October) and 19– 23 November 2003 (November); both reached intense geomagnetic activity levels, Kp=9, and Kp=8+, respectively. The October 2003 geomagnetic storm was stronger, but the effects on the Earth’s ionosphere in the mid-latitude European sector were mor...

Data-Replay Analysis of LAAS Safety during Ionosphere Storms

As reported in [2,4,5], previous Stanford research has identified the potential for severe ionosphere spatial gradients to affect Local Area Augmentation System (LAAS) integrity. In previous work [1], real-time position-domain geometry screening was used to maximize LAAS availability in the presence of ionosphere anomalies by broadcasting an inflated value of σ vig so that the maximum-ionospher...