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.
on ARRLWeb at www.arrl.org. If you connect by radio or telnet to a DX spot-ting network, you can obtain this infor-Table 1 The General Relationship between A and K Values A K Comments 0 0 Quiet 2 1 Quiet 3 1 Quiet 4 1 Quiet to unsettled 7 2 Unsettled 15 3 Active 27 4 Active 48 5 Minor storm 80 6 Major storm 132 7 Severe storm
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