Zobrazeno 1 - 10
of 72
pro vyhledávání: '"S. S. Kouris"'
Publikováno v:
Annales Geophysicae, Vol 16, Pp 1039-1042 (1998)
Daily values of the ionospheric characteristics foF2 and M(3000)F2 for a given hour and month are correlated with the corresponding daily values of sunspot number using measured data collected at seven European locations. The significance of apply
Externí odkaz:
https://doaj.org/article/fdbd0e7903d24cc889e5433fea3e544a
Publikováno v:
Nonlinear Processes in Geophysics, Vol 10, Iss 6, Pp 585-587 (2003)
An estimation of the difference in TEC prediction accuracy achieved when the prediction varies from 1 h to 7 days in advance is described using classical neural networks. Hourly-daily Faraday-rotation derived TEC measurements from Florence are used.
Externí odkaz:
https://doaj.org/article/5b56c9a50fbb4d7da56c628ebbd9187b
Publikováno v:
Annals of Geophysics, Vol 49, Iss 4-5 (2006)
The study of foF2 data measured every 5-min and of TEC measurements made every 10-min shows that the within-the-hour variability is different in the two parameters. Deciles of this variability for foF2 and for TEC are determined together with the pro
Externí odkaz:
https://doaj.org/article/9f7da00621664d42aaaf6f398f5ea615
Publikováno v:
Annals of Geophysics, Vol 47, Iss 2-3 Sup. (2004)
Electron content statistics offers important information for planning and operation of various application systems that make use of the transionospheric propagation of radio signals. Electron content statistics meet with an important difficulty: the
Externí odkaz:
https://doaj.org/article/f8806591a23544829724e70e68512315
Autor:
S. S. Kouris, E. Mizrahi, A. H. Bilge, Y. K. Tulunay, L. R. Cander, E. T. Senalp, E. Tulunay, N. Jakowski
Publikováno v:
Annals of Geophysics, Vol 47, Iss 2-3 Sup. (2004)
Total Electron Content (TEC) is an important characteristic of the ionosphere relevant to communications. Unpredictable variability of the ionospheric parameters due to various disturbances limits the efficiencies of communications, radar and navigat
Externí odkaz:
https://doaj.org/article/d0fb462deb8e494d96424cecccf0d2cd
Publikováno v:
Annals of Geophysics, Vol 47, Iss 4 (2004)
After more than 60 years of research, ionospheric disturbances are today a most challenging topic of upper atmospheric physics. Although the understanding of the thermosphere-ionosphere system has increased, quantitative predictions of ionospheric
Externí odkaz:
https://doaj.org/article/fe221a5f77194bb6a61a3e736769a73b
Publikováno v:
Annals of Geophysics, Vol 47, Iss 4 (2004)
Investigation of the relationship between TEC and (foF2)2 shows that although they are highly correlated, a «hysteresis» effect exists between them. The slab thickness is greater before than after mid-day for equal cos ?values. Moreover, a comparis
Externí odkaz:
https://doaj.org/article/a29e4b5c80aa4eeb8a5a1ba67b78d0a9
Publikováno v:
Annals of Geophysics, Vol 44, Iss 2 (2001)
A short review of published papers on the perturbations in the ionosphere due to seismogenic effects is reported. The method to correlate different classes of phenomena as ionospheric variations and subsequent seismic events is discussed. Even if the
Externí odkaz:
https://doaj.org/article/9c9c00a3f73a42dbb6e903e47658ebef
Autor:
S. S. Kouris
Publikováno v:
Annals of Geophysics, Vol 41, Iss 5-6 (1998)
A review on the solar-cycle dependence of the monthly median critical frequencies of the different ionospheric layers is attempted. Some of the existing questions are emphasized and the differing viewpoints are reported. Moreover, the correlations be
Externí odkaz:
https://doaj.org/article/7304c66f7927445a98ffff51982d39f0
Autor:
S. S. Kouris
Publikováno v:
Annals of Geophysics, Vol 41, Iss 4 (1998)
Using hourly monthly-median measured values from nine long-standing ionospheric sounding stations with data sets extending over several decades, best-fit empirical relationships are established for M (3000)F2 with different solar and ionospheric indi
Externí odkaz:
https://doaj.org/article/c9db007bb7744d1db142a3255b340d30