CONTENTS. 



PART II. 



POLAR MAGNETIC PHENOMENA AND TERRELLA EXPERIMENTS. 



CHAPTER I. 

 POLAR MAGNETIC STORMS 18821883. 



Page 



Art. 81. The Treatment of the Observations from the Polar Expedition of 1882 & 1883 . . . 319 



82, 83. The Perturbation of the 15th January, 1883 323 



84. The Perturbations of the 2nd January, 1883 339 



85. The Perturbations of the ist November, 1882 350 



86. The Perturbations of the I4th and I5th February, 1883 361 



87. The Perturbations of the I5th July, 1883 371 



88. The Perturbations of the ist February, 1883 386 



89. The Perturbations of the isth December, 1882 397 



90. The Perturbations of the I5th October, 1882 412 



CHAPTER II. 



MATHEMATICAL INVESTIGATIONS. PRELIMINARY RESUME. 



91. The Calculation of the Field of Force for the assumed Polar Current-System .... 423 



,, 92. Resume 439 



93. A Possible Connection between Magnetic and Meteorologic Phenomena 449 



CHAPTER III. 



STATISTICAL TREATMENT OF MAGNETIC DISTURBANCES OBSERVED AT THE 

 NORWEGIAN STATIONS 19021903. 



94. Introductory 451 



95. The Total Storminess as a Function of Time and its Relation to Solar Activity . . . 517 



96. On the Possible Influence of the Moon upon Magnetic Storms 519 



,, 97. The Seat of the Radiant Source 521 



98. Sun-Spots and Storminess 524 



99. Annual Variation of Storminess 526 



100. On the Diurnal Distribution of Storminess .' 536 



101. Positive and Negative Storminess 536 



102. P and N Storminess 537 



103. Properties of the Average Polar Storm 53^ 



104. Comparison of Storminess at the four Stations 541 



,, 105. Separation of Great and Small Disturbances 546 



106. The Distribution of Storminess and the Solar Origin of Polar Storms 547 



,, 107. Application to Theory 55* 



