CONTENTS ABSTRACT «2 FOREWORD «2 ee ee eo ee ee ec eee eee eran eee en eevoesee ACKNOWIEDGMBNTS. © oe ee ee eee eve 1 . SECRET @ @ @ O@ 60 6 @ @ eoeeoee@ ff 20 RERBBBEBBB @ #¢ @ ee#e%#ee08 @eeeereke?eteee @ #4 e*e.2e¢e%#+%8 eoreeogesee e @ © © 8 © eeee-¢@ Hh ee @6UhOHrhUcCOhlUh @© ee er ee Ce oeee8e8 e eee? ° Bose. @ O@ @ 20203 At Okinawa . : : : : : . © At Adak. « we ee sae At Maule ee ee seven eee &@ Zered Ze2e5 eo @ At Guam. o o ee &@© 2e2e2 e ¢ Antennas e Operat’ ng Procedury . « « « 0 « 2 2e1 In the Maresh: 11 Islands. ose Zoleh At Distant Locatimos .. @ Description of Recorders Zeorez @ 2ele3 @ In the Marsuall Islands. @ Instrumentation . «eeecee 2elel @ 201 EXPERIMENT IESIGN. 2... eeoee%e#te2s@8 CHAPTER 2 Absorption «ee eceecee Other Effects. . «ee eecece ¢@ 1.2.3 1204 86 1202 Effects at a Great Distance. @ Background. « ee eee cece eee Le2el Rising F2 Layere 0 « « 0 0 © @ 1.163 Upper Ioospheric “Knowledge. 1.1.4 Effects of Blast Rave on Laer oe o e@@e@ef @ ® ee Rising F2 Layere « eo Distant Effects. . fe Objectives. « « oo 6:0 0 ove: 1.121 1.1.2 e . Roe @ee8e@ Hee or @ INTRODUCTION, e enevnvneevreeceosves @® 1.2 se e*eee%###e#e@ee 1.2 eceenee ee CHAPTER 1 crc eevee e©e35ee «ce wpe oee#eoe%ee8#8 TAHES ec coc ILLUSTRATIONS.