File:Atmospheric Electricity in High Latitudes (1906) (14578642658).jpg

Identifier: philtrans01285435 (find matches)
Title: Atmospheric Electricity in High Latitudes
Year: 1906 (1900s)
Authors: Simpson, G.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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ries greatlyaccording to the season of the year. For this reason five curves of the daily course * The lowness of the two curves for wind strengths 0-1 and 1-2 during the first part of the winter isdue to the fact that, owing to the darkness at both the morning and evening observations then, it wasimpossible to see if the smoke of the village was drifting towards my place of observation or not. Norwas I quite aware then of the fact, which I found later, that with no wind the smoke of the villageextended in an almost invisible haze over the whole valley, out of which it could not get. This smokeeffect, of course, only acted when there was insufficient wind to drive the smoke away, and its effect isnot at all visible on the two curves with wind strength greater than two, i.e., a steady breeze. 70 MR. GEORGE C. SIMPSON ON THE are given : one each for the winter, spring, summer, and autumn three months andanother for the year taken as a whole (fig. 8). It will at once be seen that the two
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12 2 3 5 6 7A.M. 9 10 11 12 1MID-DAY. 3 5 6 7P.M. 8 9 10 11 12 Fig. 3. curves for the winter and spring lie entirely above the curve for the year and thosefor the autumn and summer entirely below.The equations to the five curves are# :— Winter three months, P = 180 + 64 sin Spring „ „ P— 177 + 57 sin Summer ,, „ P — 97 + 16 sin Autumn ,, „ P = 103 + 23 sin Whole year . . . . P = 139 + 39 sin (0+189) + 26 sin (20+155) + 4 sin(0+176) + 37sin(20+151) + 13sin(0+141)+ 9 sin (20+144)+ 4 sin(0+l7O) + 19 sin (20+184)+ 2 sin(0+177) + 23 sin (20+158)+ 5 sin (30 + 200),(30+195),(30+126),(30+131), (30+178). From these equations we see that there are two periods which must be taken intoaccount; the amplitude of the third period falls without the limits of the accuracy ofthe instrument. Of these, the greater is a whole-day period and the lesser a half-day period. We also see that the phase of the main period undergoes a regular shiftfrom a maximum in the winter to a minimum in the sumphiltrans01285435

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