1、QUESTION ITU-R 213-2/3The short-term forecasting of operational parameters fortrans-ionospheric radiocommunication andaeronautical radionavigation services(1978-1990-1993-2000-2000-2009)The ITU Radiocommunication Assembly,consideringa) that accurate, quantitative short-term predictions of ionospheri
2、c variations a few hours ordays in advance would increase the reliability of radiocommunication and aeronauticalradionavigation-satellite services including safetyrelated applications;b) that, in addition to the widespread disturbances associated with major geophysical or solarevents that affect the
3、 total electron content (TEC), the spatial and temporal gradients of TEC andthe occurrence of ionospheric scintillations, there are other hour-to-hour and day-to-day ionosphericvariations (which may be local in influence),decides that the following Questions should be studied1 What are the needs and
4、 techniques for the short-term prediction (up to a few hours inadvance) of operational parameters for trans-ionospheric radiocommunications and radionaviagtionservices?2 How useful are the established techniques of ground based and space-based space weathermonitoring for short-term prediction of trans-ionospheric propagation conditions?further decides1 that appropriate information shall be included in a Recommendation or a Handbook;2 that the above studies should be completed by 2013.Category: S3
