Transcription of Understanding Solar Indices - ARRL
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Understanding Solar Indices - ARRL
38 September 2002By Ian Poole, G3 YWXOne of the key skills for any HFDXer is to know how to judgewhat band conditions may be may be excellent one day withmany stations audible from all over theworld, but a few days later it may be thatonly a few stations are audible. To be ableto gain an idea about conditions, threemain Indices are used: Solar flux, and theAp and Kp Indices . A good workingknowledge of what these numbers repre-sent and what they mean is an advantageeven for the ham with most ionosphere can be visualized ascontaining a number of layers. In fact,there is ionization throughout the iono-sphere; the layers are really peaks in thelevels of ionization, as we can see fromFigure 1. The ionosphere affects radiowaves because according to the level ofionization, the signals are refracted, ,bent away from traveling in a straightline.
a number of factors including the time of day, the season and most important of all the sunspot cycle. It is found that the level of radiation from the Sun increases as the number of sunspots increases. Accord-ingly, the level of radiation received from the Sun peaks around the top of the sun-spot cycle. In fact, it is the bright area
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