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Satellite traces, range spread-F occurrence, and gravity wave propagation at the southern anomaly crest
(Copernicus Publications, 2010-05)
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 ...
Simulation study of the influence of the ionospheric layer height in the thin layer ionospheric model
(Springer, 2011-04)
This work aims to contribute to the understanding of the influence of the ionospheric layer height (ILH) on the thin layer ionospheric model (TLIM) used to retrieve ionospheric information from the GNSS observations. ...
Critical frequencies of the ionospheric F1 and F2 layers during the last four solar cycles: Sunspot group type dependencies
(Elsevier, 2018-06)
The long term solar activity dependencies of ionospheric F1 and F2 regions’ critical frequencies (f0F1 and f0F2) are analyzed for the last four solar cycles (1976–2015). We show that the ionospheric F1 and F2 regions have ...
Unusual nighttime impulsive foF2 enhancement below the southern anomaly crest under geomagnetically quiet conditions
(American Geophysical Union, 2011-12)
An unusual nighttime impulsive electron density enhancement was observed on 6 March 2010 over a wide region of South America, below the southern crest of the equatorial anomaly, under low solar activity and quiet geomagnetic ...
Consequences of a Solar Wind Stream Interaction Region on the Low Latitude Ionosphere: Event of 7 October 2015
(Springer, 2020-12)
In this article, we present a study of the perturbations occurring in the Earth’s environment on 7 October 2015. We use a multi-instrument approach, including space and ground observations. In particular, we study the ...
A new concept regarding the cause of ionosphere semiannual and annual anomalies
(American Geophysical Union, 2011-06)
Since the beginning of the pioneering scientific work on the ionosphere, unusual responses have been reported and have been named semiannual and annual anomalies owing to their unexplained and periodic nature. Despite more ...
Variability of ionospheric parameters during geomagnetic storms at a middle latitude station: Comparisons with IRI model
(Elsevier, 2004-12)
This paper discusses the behavior of ionospheric parameters that were obtained from electron density profiles derived from ionograms recorded at El Arenosillo (37.1°N, 353.2°E; Dip = 52; Modip = 45.5) during some intense ...
Reflection and transmission in the ionosphere considering collisions in a first approximation
(EMW Publishing, 2008-12)
Reflection and transmission coefficients (R and T) of high frequency waves propagating in the ionosphere are studied taking collisions into account. This was done approximating the expression in the refractive index using ...
Mid-latitude ionospheric effects of a great geomagnetic storm
(Elsevier, 2004-08)
On March 13, 1989 magnetic storm effects on the mid- and low-latitude ionosphere were investigated. For this, peak electron density of F2-layer (NmF2) data from four chains of ionospheric stations located in the geographic ...
Moderate geomagnetic storms and their ionospheric effects at middle and low latitudes
(Elsevier, 2011-08)
This paper reports the global response of the mid high and low latitude ionosphere in four longitudinal sectors to two moderate geomagnetic storms that occurred during 2007 (the more intense storms occurred that year). The ...