Science . erties of the AB system determines the fre-quency of the sun-spot period: the element Aescapes (let us say) in gaseous form. As thecurves are drawn there is not sufficient super-saturation to transmute A to B. This wouldoccur at td for instance. The relation of the curves td and tp willvary with the solar latitude, for td is a meregraph of temperature and depth while tp isinherently a graph of temperature and pres-sure. On passing from pole to equator tpmoves hodily from left to right in the poles the region A may thus be perma-nently absent, while at the equator td maynev
Science . erties of the AB system determines the fre-quency of the sun-spot period: the element Aescapes (let us say) in gaseous form. As thecurves are drawn there is not sufficient super-saturation to transmute A to B. This wouldoccur at td for instance. The relation of the curves td and tp willvary with the solar latitude, for td is a meregraph of temperature and depth while tp isinherently a graph of temperature and pres-sure. On passing from pole to equator tpmoves hodily from left to right in the poles the region A may thus be perma-nently absent, while at the equator td maynever fall below tp. Hence, an intermediatesun-spot zone may be inferred. Finally it is clear that the cycle of changesmay be reversed as in Fig. 2. Let the transi-tion of A into 5 be a source of heat, and letthe ensuing eleven years of the sun-spotperiod be an interval of cooling. Immedi-ately after eruption, the temperature depthline will have some high position, td, and Amatter only is in occurrence. As th
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