VI 



Page 



Art. 31. Concerning the Cause of the Positive Equatorial Perturbation .... .... 78 



32. The Negative Equatorial Storms 83 



,. 33- The Polar Elementary Storms -84 



34. The Typical Field for the Polar Elementary Storms 85 



35. The Perturbation of the isth December, 1902 87 



36. Concerning the Cause of the Perturbation ' 95 



37> 38- The Perturbation of the loth February, 1903 106 



I 39- Concerning the Cause of the Perturbation 113 



40 43. The Perturbations of the 3oth and 3151 March, 1903 115 



4447. The Perturbations of the 22nd March, 1903 127 



48. The Perturbations of the 26th December, 1902 137 



49- Cyclo-Median Storms 144 



5> 5 1 - The Perturbation of the 6th October, 1902 145 



52. Concerning the Cause of the Perturbation 149 



53. Further Comparison with Stormer's Mathematical Theory 158 



CHAPTER III. 

 COMPOUND PERTURBATIONS. 



54. The Perturbation of the 29th and 3oth October, 1902 161 



55. The Perturbation of the 25th December, 1902 164 



56. The Perturbation of the 28th December, 1902 169 



57> 58- The Perturbations of the I5th February, 1903 172 



59, 60. The Perturbations of the 7th and 8th February, 1902 187 



61, 62. The Perturbations of the 27th and 28th October, 1902 209 



63, 64. The Perturbations of the 28th and 2gth October, 1902 222 



65, 66. The Perturbations of the 3ist October and ist November, 1902 230 



67. How these Perturbations may be explained 234 



68. The Perturbations of the nth and I2th October, 1902 251 



69. Concerning the Cause of the Perturbations. Positive and negative Polar Storms . . . 268 



70, 71. Tht Perturbations of the 23rd and 24th November, 1902 272 



" 7 2 73- The Perturbations of the 26th and 27th January, 1903 286 



74. Further Comparison with the Terrella-Experiments 297 



CHAPTER IV. 



CONCERNING THE INTENSITY OF THE CORPUSCULAR PRECIPITATION 

 IN THE ARCTIC REGIONS OF THE EARTH. 



75. Development of General Formulae 303 



7679. Numerical Values for Height and Strength of Current 306 



80. The Energy of the Corpuscular Precipitation. The Source of the Sun's Heat . . . . 311 



