Cesar E. Valladares

TL;DR: In this article, a new numerical algorithm was developed to automatically detect TEC bite-outs that are produced by the transit of equatorial plasma bubbles, which was applied to TEC values measured by the Low Latitude Ionospheric Sensor Network (LISN) and by receivers that belong to 3 other networks that exist in South America.

TL;DR: There is a growing appreciation that the environmental conditions that we call space weather impact the technological infrastructure that powers the coupled economies around the world as discussed by the authors, and there is also a growing awareness that space weather impacts the technologies that are used in the world.

TL;DR: In this paper, the authors compare observations of equatorial plasma bubbles (EPBs) by polar-orbiting satellites of the Defense Meteorological Satellite Program (DMSP) with plasma density measurements from the Republic of China Satellite (ROCSAT-1) in a low-inclination orbit.

TL;DR: In this article, the ionospheric effects of a halo coronal mass ejection (CME) initiated on the Sun on September 20, 1999, and causing the largest magnetic storm during this month on September 22, 23, and 24, 1999 were studied through their effects on a prototype of a Global Positioning System (GPS)-based navigation system called Wide Area Augmentation System (WAAS) and their impact on global VHF/UHF communication systems.

TL;DR: In this article, the authors investigate the ionospheric response to several stratospheric sudden warming events which occurred in Northern Hemisphere winters of 2008 and 2009 during solar minimum conditions using GPS total electron content data in a broad latitudinal region at ±40° geographic latitude and a single longitude, 75°W.