The November 2004 superstorm: Comparison of low-latitude TEC observations with LLIONS model results

The November 2004 superstorm: Comparison of low-latitude TEC observations with LLIONS model results

Matthew A. Hei1, Cesar E. Valladares1 

1Boston College, Institute for Scientific Research, St. Clement's Hall 412, 140 Commonwealth Avenue, Chestnut Hill, MA 02467-3800, USA

Correspondence to:

Cesar Valladares
Esta dirección electrónica esta protegida contra spam bots. Necesita activar JavaScript para visualizarla

Key Points:

• EIA;
• CPZ; 
• Superstorm; 
• Superfountain; 
• GPS; 
• TEC

Abstract:

We investigate the effects of penetration electric fields, meridional thermospheric neutral winds, and composition perturbation zones (CPZs) on the distribution of low-latitude plasma during the 7–11 November 2004 geomagnetic superstorm. The impact on low-latitude plasma was assessed using total electron content (TEC) measurements from a latitudinally distributed array of ground-based GPS receivers in South America. Jicamarca Radio Observatory incoherent scatter radar measurements of vertical E×B drift are used in combination with the Low-Latitude IONospheric Sector (LLIONS) model to examine how penetration electric fields and meridional neutral winds shape low-latitude TEC. It is found that superfountain conditions pertain between ∼1900 and 2100 UT on 9 November, creating enhanced equatorial ionization anomaly (EIA) crests at ±20° geomagnetic latitude. Large-amplitude and/or long-duration changes in the electric field were found to produce significant changes in EIA plasma density and latitudinal location, with a delay time of ∼2–2.5 h. Superfountain drifts were primarily responsible for EIA TEC levels; meridional winds were needed only to create hemispherical crest TEC asymmetries. The [O/N2] density ratio (derived from the GUVI instrument, flown on the TIMED satellite) and measurements of total atmospheric density (from the GRACE satellites), combined with TEC measurements, yield information regarding a likely CPZ that appeared on 10 November, suppressing TEC for over 16 h.

*click here to read this paper.


Primer Taller de Trabajo Low-Latitude Ionospheric Sensor Network



El taller tiene la finalidad de instruir a científicos, ingenieros y estudiantes de América del Sur en como emplear receptores de GPS y magnetómetros, para diagnosticar el estado y variabilidad de la ionósfera de bajas latitudes, e instruir en el procedimiento de como instalar y operar el estado...




» Magnetómetro LISN en Argentina

» LISN en la búsqueda de formar un observatorio distribuido
Acerca de LISN      |      Equipos      |      Información técnica y científica      |      Estaciones      |      Datos      |      Miscelánea      |      Descargas      |      Contacto
Copyright © 2017 Low-latitude Ionospheric Sensor Network    |    Radio Observatorio de Jicamarca     |     Instituto Geofísico del Perú