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p 20 The method of analysis
p 28 The Sq and SD variations
p 42 DS in the first six storm hours Figure 26
26 magnetic observatories amplitude appropriate to weak April April 24 August August 22 component Egm component of DS dial points different latitudes DS in H DS variation DS(H Dst(H entry in row February February 18 fh cm fh fh focal latitude force H force scale GEOMAGNETIC STORMS gm latitude 58 Godhavn graphs harmonic component harmonic dials horizontal force horizontal vectograms hourly values Huancayo indices intensity index January January 16 January 27 July June June 18 latitude 65 magnetic storm main phase March March 27 mean gm latitude October October 13 PANEL SC storms SD vectograms SD(E SD(H seasonal subdivisions September September 21 sequences Sq and SD Sq sheet storm field STORM TIME UNIFORM STORMS MODERATE STORMS Sydney Chapman third storm day three intensity sets three storm days variation Dst vectograms of Sq weak and moderate weak storm intensity WEAK STORMS MODERATE