Results 151 to 160 of about 853 (193)

The Evolving Scenario of ES-SCLC Management: From Biology to New Cancer Therapeutics. [PDF]

Genes (Basel)
Trillo Aliaga P, Del Signore E, Fuorivia V, Spitaleri G, Asnaghi R, Attili I, Corvaja C, Carnevale Schianca A, Passaro A, de Marinis F.   +9 more
europepmc   +1 more source

The Relationship of Stratospheric QBO with the Difference of Measured and Calculated NmF2 [PDF]

Acta Geophysica, 2016
The relationship between stratospheric QBO and the difference (ΔNmF2) between NmF2 calculated with IRI-2012 and measured from ionosondes at the Singapore and Ascension stations in the equatorial region was statistically investigated. As statistical analysis, the regression analysis was used on variables.
Ramazan Atici, Kadri Kurt, Selcuk Sagir   +2 more
exaly   +3 more sources

A new global empirical NmF2 model for operational use in radio systems

Radio Science, 2011
The ionospheric F2 region around the peak electron density height hmF2 of about 250–500 km causes the most pronounced impact on transionospheric radio wave propagation. Therefore, the peak electron density of the F2 layer NmF2 is a key parameter for characterizing the ionosphere.
Mohammed Mainul Hoque, Norbert Jakowski
exaly   +6 more sources

Quiet-condition hmF2, NmF2, and B0 variations at Jicamarca and comparison with IRI-2001during solar maximum

Journal of Atmospheric and Solar-Terrestrial Physics, 2006
We use the measurements of the Jicamarca digisonde to examine the variations in F2 layer peak electron density (NmF2), its height (hmF2), and the F2 layer thickness parameter (B0) near the dip equator.
Bodo Reinisch
exaly   +2 more sources

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Dependence of the Annual Asymmetry Local Index for the NmF2 Median on Solar Activity

Геомагнетизм и аэрономия, 2023
Based on the medians of the F2-layer maximum electron concentration NmF2 for two ionosphericstations, Boulder and Hobart, in 1963–2013, an analysis of the dependence of the annual asymmetry localindex R at noon on solar activity has been performed, where the R index is the January/July ratio of the summaryNmF2 concentration for this pair of stations ...
M. G. Deminov, G. F. Deminova
openaire   +1 more source

Dependence of the Local Index of Annual Asymmetry for NmF2 on Solar Activity

Geomagnetism and Aeronomy, 2021
The dependence of the local annual asymmetry index AI on solar activity has been analyzed based on daily data on the noon values of the F2-layer maximum electron density, NmF2, at the Boulder and Hobart ionospheric stations for 1963–2002. The AI index characterizes the relative difference in the total electron density NmF2 in January and July for a ...
M. G. Deminov, G. F. Deminova
openaire   +1 more source

A statistical study of the mid-latitude NmF2 winter anomaly

Advances in Space Research, 2010
Hourly values of the F2-layer peak density, NmF2, measured by 62 ionosonde stations from 1957 to 2008 at middle geomagnetic latitudes of the northern and southern hemispheres are used in a statistical study of the F2-region winter anomaly. We analyze a maximum value, R, of the winter/summer geomagnetically quiet daytime NmF2 ratio over each ionosonde ...
A.V. Pavlov, N.M. Pavlova, S.F. Makarenko   +2 more
openaire   +1 more source

Annual and semiannual periodicities in NmF2 in the African sector

Journal of Atmospheric and Terrestrial Physics, 1983
Abstract The annual and semiannual periodicities in amplitude and phase of NmF 2 have been computed for eleven stations in the African sector. The computations are for the sunspot maximum years of 1958 and 1968 and the solar minimum of 1964. Four patterns of diurnal behaviour in NmF 2 are discerned for different dip latitudes.
M.C. Isherwood, L.B. Kolawole
openaire   +1 more source

Harmonic analysis of NmF2 over Chungli, a subtropical location

Acta Physica Hungarica, 1994
An empirical model based on a harmonic analysis approach for calculating the peak density of ionospheric F layer over Chungli (24.95° N, 121.23° E) for all levels of solar activity is proposed. The harmonic coefficients were obtained by normalizing the NmF2 data collected during the period 1976 to 1983 to a common level of solar activity.
S. Baruah, P. K. Bhuyan
openaire   +1 more source

Simultaneous response of NmF2 and GPS-TEC to storm events at Ilorin

Advances in Space Research, 2018
Abstract A comparative study of both TEC and NmF2 variations during quiet and disturbed conditions has been investigated using simultaneous measurements from dual frequency Global Positioning System (GPS) receiver and a DPS-4 Digisonde co-located at Ilorin (Geog. Lat. 8.50°N, Long. 4.50°E, dip. – 7.9°). The results of the quiet time variations of the
P H Doherty, J O Adeniyi, I A Adimula
exaly   +3 more sources