Buscar
Mostrando ítems 1-10 de 3101
foF2 long-term trends at the southern crest of the equatorial anomaly
(Elsevier Ltd., 2006-12)
Long-term trends in the electron density of the ionosphere for the period 1957-1986 is studied using foF2 monthly median hourly data measured at Tucuman (26.9S, 65.4W), a station located at the southern crest of the ...
Long-term trends of poverty in Latin American countries
(Universidad de Chile. Facultad de Economía y Negocios, 2001-06)
The article attempts an assessment of the long-term evolution of poverty in the
four Latin American countries for which there is enough historical data. Argentina,
Colombia, Chile, and Mexico represent a variety of the ...
Earth magnetic field and geomagnetic activity effects on long-term trends in the F2 layer at mid-high latitudes
(Elsevier, 2006-12)
It is well known that the Earth magnetic field, as well as geomagnetic activity, presents long-term variations.Both phenomena affect the height of the F2 layer peak, hmF2, and the maximum electron concentration estimated ...
Discrete wavelet analysis to assess long-term trends in geomagnetic activity
(Elsevier Ltd., 2006-12)
To assess long-term trends in geomagnetic activity, the discrete wavelet transform using the Daubechies function was applied to aa and Dst for periods 1868–2003 and 1957–2003 respectively.Among a variety of techniques ...
Effect of the Inclusion of Solar Cycle 24 in the Calculation of foF2 Long-Term Trend for Two Japanese Ionospheric Stations
(Birkhauser Verlag Ag, 2019-08)
One of the main ionization sources of the F2 region of the Earth’s ionosphere is the solar EUV irradiance accounting for * 90% of its variability during quiet time. Consequently, prior to long-term trend estimations solar ...
FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
(American Geophysical Union, 2016-01)
Long-term trend of the critical frequency of the F2 ionospheric region, foF2, at Phu Thuy station (21.03°N, 105.96°E), Vietnam, located under the northern crest of the equatorial ionization anomaly, EIA, is studied. Annual ...
Incidence of solar cycle 24 in nighttime foF2 long-term trends for two Japanese ionospheric stations
(Springer, 2020-06)
Ionospheric long-term trend studies are of great scientific interest since they contribute to the more general and controversial climatic change issue. In this paper we analyze the effect of the inclusion of solar cycle ...