Buscar
Mostrando ítems 11-20 de 240
Trends in the F2 ionospheric layer due to long-term variations in the Earth's magnetic field
(Elsevier, 2009-06)
The Earth's magnetic field presents long-term variations with changes in strength and orientation. Particularly, changes in the dip angle (I) and, consequently, in the sin(I)cos(I) factor, affect the thermospheric neutral ...
Observed auroral ovals secular variation inferred from auroral boundary data
(MDPI, 2021-08)
We analyze the auroral boundary corrected geomagnetic latitude provided by the Auroral Boundary Index (ABI) database to estimate long-term changes of core origin in the area enclosed by this boundary during 1983–2016. We ...
Secular variation of births, weight and length at birth: local perspective
(2015)
Objective: To analyse the outcomes of births and anthropometric measurements at birth of children born between 1974 and 2011 at Limache Hospital (Valparaiso, Chile). Patients and method: Times series were constructed of ...
An upper limit to the secular variation of the gravitational constant from white dwarf stars
(Iop Publishing, 2011-05)
A variation of the gravitational constant over cosmological ages modifies the main sequence lifetimes and white dwarf cooling ages. Using an state-of-the-art stellar evolutionary code we compute the effects of a secularly ...
Estudio de la variación secular en la talla de poblaciones humanas del centro de Argentina durante el Holoceno tardíoStudy of secular variation in the height of human populations from the center of Argentina during the late Holocene
(Universidad de Magdalena, 2019-09)
El objetivo de este trabajo es estudiar la variación secular en la talla de las poblaciones humanas que habitaron el centro de Argentina a lo largo del Holoceno tardío. Se espera encontrar una variación en la estatura y ...
Quantifying solar flux and geomagnetic main field influence on the equatorial ionospheric current system at the geomagnetic observatory Huancayo
(Elsevier, 2017-10)
In order to analyse the sensitivity of the equatorial ionospheric current system, i.e. the solar quiet current system and the equatorial electrojet, to solar cycle variations and to the secular variation of the geomagnetic ...
Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin
(European Geosciences Union, 2018)
Abstract. We present a different view of secular variation
of the Earth’s magnetic field, through the variations in the
threshold rigidity known as the variation rate of geomagnetic
cutoff rigidity (VRc). As the geomagnetic ...
Long-term changes in solar quiet (Sq) geomagnetic variations related to Earth?s magnetic field secular variation
(American Geophysical Union, 2013-01)
The daily amplitude of the solar quiet (Sq) magnetic variation of the horizontal intensity, H, of observatories at low and midlatitudes is analyzed, in search of significant long‐term trends. These trends are expected based ...
First archeointensity results from Portuguese potteries (1550-1750 AD)
(TERRA SCIENTIFIC PUBL CO, 2009)
Geomagnetic field variations at archeomagnetic timescales can be obtained from well-dated heated structures and archeological potsherds. Here, we present the first archeointensity results obtained oil Portuguese ceramics ...