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56.013  Articles
1 of 5.602 pages  |  10  records  |  more records»
We analyze the temporal distribution of sunspot groups for even and odd cycles in the range SC12- SC24. It seems that cycle 24 is a characteristic even cycle, although with low amplitude. The number of large sunspot groups for cycle 24 is relatively small... see more

In this research, the seasonal Optimal Reliable Frequency (ORF) variations between different transmitter/receiver stations have been determined. Mosul, Baghdad, and Basra have been chosen as tested transmitting stations that located in the northern, cente... see more

In this research, the seasonal Optimal Reliable Frequency (ORF) variations between different transmitter/receiver stations have been determined. Mosul, Baghdad, and Basra have been chosen as tested transmitting stations that located in the northern, cente... see more

A aplicação da combinação livre da ionosfera para dados GNSS de dupla frequênciapermite eliminar matematicamente os efeitos de primeira ordem da ionosfera.Contudo, os efeitos de ordem superior não são eliminados e, geralmente, sãonegligenciados no process... see more

The last three solar cycles have been considered for a study on the variation of the ionospheric parameter foF2 during the solar minimum. Hourly observations recorded by the ionospheric station of Rome have been considered for the years 1985, 1986, 1987, ... see more

The last three solar cycles have been considered for a study on the variation of the ionospheric parameter foF2 during the solar minimum. Hourly observations recorded by the ionospheric station of Rome have been considered for the years 1985, 1986, 1987, ... see more

The last three solar cycles have been considered for a study on the variation of the ionospheric parameter foF2 during the solar minimum. Hourly observations recorded by the ionospheric station of Rome have been considered for the years 1985, 1986, 1987, ... see more

Ionospheric irregularities degrade the performance of radio technological system by producing fluctuations in amplitude and phase of signal passing through them, a phenomenon which is known as scintillations. This study presents diurnal and seasonal varia... see more

Solar thermal energy (STE) technology refers to the conversion of solar energy to readily usable energy forms. The most important component of a STE technology is the collectors; these absorb the shorter wavelength solar energy (400-700nm) and convert it ... see more

1 of 5.602 pages  |  10  records  |  more records»