Mapping the East African Ionosphere Using Ground-based GPS TEC Measurements

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...

Tomographic reconstruction of the ionosphere using ground-based GPS data in the Australian region

This paper describes the experimental procedures of tomographic imaging techniques that have been developed and used at La Trobe University. Tomographic imaging provides a powerful technique for obtaining images of the ionospheric electron density distribution, and is a relatively new technique which has promising features to supplement the most expensive ground-based vertical sounding instrume...

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

On the ionosphere calibration in GPS radio occultation measurements

Elimination of the ionospheric contribution to atmospheric delays in GPS radio occultation measurements is a key issue in the retrieval of accurate pressure and temperature profiles above the tropopause. The traditional so-called “ionosphere-free” combination of the L1 and L2 phase paths, eliminating the first-order ionospheric effects, is not sufficient because of the nonnegligible bending of ...

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...