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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 5
Ann. Geophys., 28, 1133–1140, 2010
https://doi.org/10.5194/angeo-28-1133-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 1133–1140, 2010
https://doi.org/10.5194/angeo-28-1133-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  18 May 2010

18 May 2010

Satellite traces, range spread-F occurrence, and gravity wave propagation at the southern anomaly crest

M. A. Cabrera1,2, M. Pezzopane3, E. Zuccheretti3, and R. G. Ezquer1,2,4 M. A. Cabrera et al.
  • 1CIASUR, Facultad Regional Tucumán, Universidad Tecnológica Nacional, Tucumán, Argentina
  • 2Laboratorio de Ionósfera, Dpto. de Física, Universidad Nacional de Tucumán, Argentina
  • 3Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
  • 4Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

Abstract. Range spread-F (RSF) and occurrence of "satellite" traces prior to RSF onset were studied at the southern peak of the ionospheric equatorial anomaly (EA). Ionograms recorded in September 2007 at the new ionospheric station of Tucumán, Argentina (26.9° S, 294.6° E, dip latitude 15.5° S), by the Advanced Ionospheric Sounder (AIS) developed at the Istituto Nazionale di Geofisica e Vulcanologia (INGV), were considered.

Satellite traces (STs) are confirmed to be a necessary precursor to the appearance of an RSF trace on the ionograms. Moreover, an analysis of isoheight contours of electron density seems to suggest a relationship between RSF occurrence and gravity wave (GW) propagation.

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