1、ITU-R RECMN*P* SERIES 95 4855212 0527445 177 Rec. ITU-R P.M.6-1 85 RECOMMENDATION RU-R P.846-1 MEASUREMENTS OF IONOSPHERIC AND RELATED CHARACTERISTICS (Question UIT-R 222/3) (1992-1995) The ITU Radiocommunication Assembly, considering that regular long-term measurements of ionospheric and solar char
2、acteristics are required for studies of that measurements of solar-terrestrial. geomagnetic and ionospheric parameters are required for the short-term that radiocommunication between Earth and space at frequencies above 30 MHz can be significantly affected a) improvements in ionospheric maps and pro
3、pagation models; b) forecasts of ionospheric propagation; c) by propagation conditions in the ionosphere, recommends 1 that ionospheric characteristics, as measured by the established worldwide network of ionospheric measuring stations and archived at World Data Centres set up by ICSU, be used for i
4、onospheric mapping and propagation modelling purposes; 2 that the 2 800 MHz (10.7 cm) solar noise-flux, as measured by the National Research Council (NRC), Canada, continues to be used to determine the index a; 3 that sunspot numbers continue to be represented by the indices of International Relativ
5、e Sunspot Numbers produced by the Sunspot Index Data Centre sponsored by the Observatoire Royal de Belgique and the Federation of Astronomical and Geophysical Data Analysis Service (FAGS); 4 that solar, geomagnetic and ionospheric characteristics be regularly measured and the resulting data exchange
6、d rapidly for use in short-term forecasts of ionospheric propagation conditions; 5 that the following characteristics associated with trans-ionospheric propagation be measured on a systematic basis and the resulting data be made available to the ITU-R: - total electron content, amplitude and phase scintillations, absorption, Faraday polarization rotation, group delay, coherence bandwidth, and variations in the direction of arrival. COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
