GEOPHYSICAL OBSERVATORY REPORTS, YEAR 1994-1998 - NAGYCENK GEOPHYSICAL OBSERVATORY (Sopron, 2001)

1994-1998 - CONTENTS

CONTENTS Preface - V. Wesztergom 3 I. Description of the observatory — V. Wesztergom 5 II. History (The beginnings and the IGY) - P. Bencze 9 III. Geomagnetism 25 Earth current measurements - J. Verő 25 Electric activity indices 45 Magnetic measurements and data processing - V. Wesztergom 71 Geomagnetic data 76 Hourly mean values of H, D, Z 77 Daily mean values of H, D, Z 109 Geomagnetic К indices 115 Special phenomena: SSC, sfe 141 Annual mean values of geomagnetic elements 144 IV. Atmospheric electricity and ionosphere 145 Experimental study of atmospheric electricity and the ionosphere -P. Bencze 145 Some results of analyses based on atmospheric electric and ionospheric data of previous observatory reports - F. Märcz 161 Atmospheric electricity data 169 Hourly means of the potential gradient 170 Hourly means of quantities of positive and negative charges transported by point-discharge for each month 290 Ionosphere data 301 Mean ionospheric absorption L'(dB) at oblique incidence (A3), / = 270 kHz 302 Schumann resonance observations - G. Sátori 347

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